Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e9db5be55406577…

MALICIOUS

PDF

92.8 KB Created: 2021-04-04 23:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a42c6103fff8c858d5d122946e6e47b9 SHA-1: 31a0d91e2b4297e66606623e53d63067d272a82f SHA-256: 6e9db5be55406577deedd4a0b9214b188cbb514abba7e18664505cf9052ab3be
194 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm designed to redirect users to potentially malicious content. The document's structure and embedded URLs suggest an attempt to disguise malicious links as legitimate resources, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous external links on disposable hosting points to a downloader or redirector pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=departmental+test+answer+key+july+2019
    • http://bobatukuxoto.iblogger.org/58379202761.pdf
    • http://malurafokopumer.22web.org/buberoxamadopapepe.pdf
    • https://cdn-cms.f-static.net/uploads/4487916/normal_6023fd6fa10bd.pdf
    • https://cdn-cms.f-static.net/uploads/4368969/normal_6026511bc0a5b.pdf
    • https://cdn-cms.f-static.net/uploads/4393506/normal_5fe7926230423.pdf
    • https://bivesazi.weebly.com/uploads/1/3/4/6/134652180/d088ff204de.pdf
    • https://cdn-cms.f-static.net/uploads/4489414/normal_5fea27627752a.pdf
    • https://vexigijetizi.weebly.com/uploads/1/3/4/7/134771524/e2035c663930910.pdf
    • https://fubomagasikeka.weebly.com/uploads/1/3/4/4/134474343/vugenufo.pdf
    • https://fogofude.weebly.com/uploads/1/3/4/3/134322730/3025717.pdf
    • http://wodesutama.iblogger.org/patriots_football_schedule_2015.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • http://povumuvepu.epizy.com/votusadugupomigufa.pdf
    • http://vodoxaxadax.rf.gd/acrylic_plastic_sheets_calgary.pdf
    • https://76f5a3e5-08d8-4581-9975-6c1b933a1845.filesusr.com/ugd/dbbd16_52ae223a0b7b46ccb0605f8f3cdb25ab.pdf?index=true
    • https://3c31dc6e-14a3-4e60-a373-897e90814001.filesusr.com/ugd/9e17d8_90d3ca7ea088470f84df7f7eb678189e.pdf?index=true
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_12b6170b212342b8a78f88ea069e38e9.pdf?index=true
    • http://zogirifo.epizy.com/code_de_l_urbanisme_au_cameroun.pdf
    • https://46a1ac71-481d-4a85-b709-d40f3a189542.filesusr.com/ugd/143c98_bd4c55837a65449f9cf3257718b1a137.pdf?index=true
    • http://dinixebun.epizy.com/pusomizilefezano.pdf
    • http://gofuxanuwuj.rf.gd/double_digit_addition_without_regrouping_worksheets.pdf
    • https://2ac56fc1-f7ee-4366-9cb2-1681469c68ee.filesusr.com/ugd/b914b5_ca0fc06a92874e479f3a9ff63154efc7.pdf?index=true
    • http://rubirabe.rf.gd/hays_australia_timesheet_login.pdf
    • http://xofenilar.epizy.com/how_many_carbs_in_boston_market_chicken_pot_pie.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb44.bin
2514ee257b9dd206467852192875dc1a59d809d02de719d5c163aee9155a4b1b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB44 5780 bytes
font_01_sfnt_off00010efc.bin
3a0b76a0dc892e12af19d2b8330ba249d3f45ee8a1e85e732f0b4b250a3e012a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFC 21496 bytes
font_02_sfnt_off0001407f.bin
31cf091b1be472f78a0d7c926af4302e8aa23eb693e931f0ba8d52cca53a7dd6
pdf-font-stream PDF embedded font (sfnt) at offset 0x1407F 10660 bytes