Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdde234c9f36d94d…

MALICIOUS

PDF

80.6 KB Created: 2021-04-24 22:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6e1b4bf74e60436bb37c720bfa8dcad3 SHA-1: 7019e486dfab30cf34f34e9966dab5d089b9c68e SHA-256: cdde234c9f36d94d73b656cdc496d05eadefc837694558d8454e96abff732336
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • 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://golowaki.ru/strik?utm_term=avh-x2500bt+memory+full PDF link annotation
    • http://callipakk2.site/android_10_update_for_vivo_v17_proikqpv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388815/normal_5fcf5aa553927.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482648/normal_604e917a180b2.pdfIn PDF document text
    • http://wow50.pro/free_bitlocker_for_window_7npr1q.pdfIn PDF document text
    • https://cdn.sqhk.co/juzosugun/jejeiiQ/big_business_deluxe_edem_plaza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376127/normal_60013df892007.pdfIn PDF document text
    • http://ruxuzosok.mywebcommunity.org/83482204959.pdfIn PDF document text
    • http://vijevejumozugim.sportsontheweb.net/jirefolobarefa.pdfIn PDF document text
    • http://topvideo.design/focusrite_mix_control_no_hardware_connectedq7xdt.pdfIn PDF document text
    • https://cdn.sqhk.co/misusulebix/66jefge/fondant_giraffe_cake_topper_tutorial.pdfIn PDF document text
    • https://cdn.sqhk.co/poxosafixe/arjiIws/eolien_offshore_le_treport.pdfIn PDF document text
    • http://ijmalan.xyz/these_systems_are_used_in_managing_d82os2.pdfIn PDF document text
    • https://cdn.sqhk.co/dixejetafap/GKZqwid/kezerufanejoz.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/jymiag9/dulce_et_decorum_est_annotated.pdfIn PDF document text
    • http://jozipuvuwuzaj.mywebcommunity.org/exam_ref_az_103_microsoft_azure_administrator_download_free.pdfIn PDF document text
    • http://cpskras.website/is_there_a_directv_remote_appbv6s7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tedowafomaru/what_legislation_did_the_care_act_replace.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/jusifud.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/review_sheet_mask_garnier_ageless_white.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2192f4ff-a003-44ce-adea-8d91c1cda72d/31320532193.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0744f14a-9b84-423c-ab70-98b26e3519a3/how_long_do_jenn_air_ranges_last.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15E 5136 bytes
SHA-256: e0d7fa638cc1e4e12f9eaa61f71095eab8d515c5e4b0f43f90a30aed14f75cf3
font_01_sfnt_off0000e2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F2 3896 bytes
SHA-256: 05e1460b747bfd5f9d8318563673199405a0b37afa811e3d9e1991adf5f8955c
font_02_sfnt_off0000ed14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED14 10304 bytes
SHA-256: 72a7dde985988b08b73ebfdf0a3362feddcf5fe8dd39c2f1aa26b68053c265fe
font_03_sfnt_off000110a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A0 16304 bytes
SHA-256: 8fe31ac2096c5e11ca20e474ac9d4b0e624cd7c6a3d6648e58269b78a2b36287
font_04_sfnt_off00012615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12615 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f