Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf7b925fc2e08a1…

MALICIOUS

PDF

85.7 KB Created: 2021-04-06 17:08:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: c5e3a7bf3dee8320628dc9e64d7876da SHA-1: 90ea9ba1d81e50182944cf7b08c14035d8716ce0 SHA-256: 1cf7b925fc2e08a1c3ff9f65ef4705a547335d057d8375de8e4a1c756f8bc9c9
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with several pointing to suspicious domains like 'pelibifir.ru' and 'plsale.pro'. Heuristics indicate a link farm designed to redirect users, and ClamAV flags it as a phishing trojan. The embedded content, though obfuscated, appears to be related to search terms, suggesting a lure for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pelibifir.ru/wix?keyword=one+direction+forever+young+download PDF link annotation
    • http://plsale.pro/complete_english_grammar_for_beginners90jnh.pdfIn PDF document text
    • http://shimano-stradic.ru/4263625327142qfk.pdfIn PDF document text
    • https://cdn.sqhk.co/fisoxinizo/iaQrjia/68458212827.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/hcsLjal/vexadizexujujow.pdfIn PDF document text
    • https://rebazizezasij.weebly.com/uploads/1/3/4/5/134586802/durog_kideta.pdfIn PDF document text
    • http://creditactive.info/something_just_like_this_piano_sheet_music_freerxnqm.pdfIn PDF document text
    • https://cdn.sqhk.co/petebeki/Ahjb2jc/minions_mod_minecraft_pe.pdfIn PDF document text
    • https://vanevuzitikuge.weebly.com/uploads/1/3/4/5/134588875/9950684.pdfIn PDF document text
    • https://cdn.sqhk.co/gijimexuv/uHggHi0/pavotigow.pdfIn PDF document text
    • https://xatevixi.weebly.com/uploads/1/3/4/6/134651360/vigosijem-gewavuwujatare-fosivu-gavuwumokum.pdfIn PDF document text
    • https://cdn.sqhk.co/wifepodilojo/UMigqhh/zububusigexalanifen.pdfIn PDF document text
    • https://biziliwedurukax.weebly.com/uploads/1/3/4/8/134889104/a52580.pdfIn PDF document text
    • http://esclick.pro/retro_arcade_machine_x_hackbdkno.pdfIn PDF document text
    • http://richteam.site/trying_to_reconnect_league_of_legends_macignys.pdfIn PDF document text
    • https://jewakazakiven.weebly.com/uploads/1/3/1/4/131437085/pilexegumet.pdfIn PDF document text
    • https://ludurodeb.weebly.com/uploads/1/3/4/8/134852143/9010393.pdfIn PDF document text
    • https://nebobaxewakizix.weebly.com/uploads/1/3/1/6/131637309/roleronabal-bujab-vivudigojabi-webedesujavam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/38a5850d-387c-4eac-8f9a-a5d2f002b962/mogojuxevamafirutej.pdfIn PDF document text
    • https://7a512b58-7189-4bc4-8343-f643fa9054c9.filesusr.com/ugd/1e52da_44321a31c03749078ba6f1b6ec724780.pdf?index=trueIn PDF document text
    • https://75e6061f-eb7a-4ce8-b546-077bf96366c3.filesusr.com/ugd/2dfd19_9424bf8558b1419a941f7cd5ffbcc6d5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4845e00-aeb8-4640-83b5-7549c04030e3/junonap.pdfIn PDF document text
    • https://48bd7725-9370-4d18-884e-e75d7b70c9c4.filesusr.com/ugd/f241d9_6348c81bfbd34e109aca57c5a3916491.pdf?index=trueIn PDF document text
    • https://ad858f6a-7bbb-416d-9365-e04d7986ed9b.filesusr.com/ugd/3c9ac1_6e63adcc64e7473b8e59f05449fa03e6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5c64df1-53d5-411a-86a3-e99d0b631fb7/10141872819.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0fa25ab-0b99-4feb-b8a2-d45a0905fd37/aprendizajes_clave_curso_en_linea.pdfIn PDF document text
    • https://cf4de027-7369-46c2-bf93-d69cabef2b5e.filesusr.com/ugd/868b90_49ec5c5e9a3b484f9a572a21704c2f3e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/da6e3da6-55b1-4949-a7ba-d812440a493c/everless_la_hechicera_y_el_alquimista_gratis.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC26 5292 bytes
SHA-256: 9b8a7fedd78bbd550573d6c69172a16f00d5ebc9bb1fef4f1012c48aa7a722e7
font_01_sfnt_off0000fe45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE45 3592 bytes
SHA-256: c9f027f9c8b1fc89fe241fb35a9f13611344626b46ae906031fe8a339adb7cf1
font_02_sfnt_off00010c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9E 11400 bytes
SHA-256: b44f606fcb5d56c15263f44e22fca784c3c299105a02930d9100d1970b374e7e
font_03_sfnt_off00013347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13347 16144 bytes
SHA-256: f0a8b786da721c7415a59d91fbce3b20bbb98ea32e48857ac1ff22d53b00ec29