Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2cfaf94deece535…

MALICIOUS

PDF

73.5 KB Created: 2021-02-27 11:16:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 4895fa7af8e4783374e8cb18c75e22ac SHA-1: c96bbfc9bc819b4a7f240f88caf2bcda9a56add1 SHA-256: a2cfaf94deece53521c960f1f85cc8d175b711928a60d54737cb69484e4d98fa
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to 'animal voice ringtone'. The presence of multiple disposable domains and link farm heuristics indicates a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/wix?keyword=animal+voice+ringtone PDF link annotation
    • http://regvoolkim.website/gisawinojibemixobonelewyh3s.pdfIn PDF document text
    • http://neojust.ru/wosuzuzogilitesaliljzgkp.pdfIn PDF document text
    • https://cdn.sqhk.co/vefuwebilux/ciihhjf/73238491796.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485442/normal_601930b99fc29.pdfIn PDF document text
    • https://cdn.sqhk.co/diwiporeb/cijFjfo/small_business_manager_job_description_sample.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480382/normal_6033d64590531.pdfIn PDF document text
    • http://siwosupegejolop.medianewsonline.com/67862073763.pdfIn PDF document text
    • https://cdn.sqhk.co/gebunemif/9iciA9n/tumblr_themes_free_cute.pdfIn PDF document text
    • http://endi-itali.space/pixel_swordfish_io_hack_apkcobra.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/baby_goats_bouncing_on_trampoline.pdfIn PDF document text
    • http://davupopebuwiser.sportsontheweb.net/jogging_stroller_that_fits_chicco_keyfit_30_car_seat.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwifemi/hd5icSc/vr_danger_zombie_shooting.pdfIn PDF document text
    • https://cdn.sqhk.co/wibononuve/heujhPC/just_kill_me_3_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368972/normal_5fc6397b6f6fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388062/normal_60048383abbd8.pdfIn PDF document text
    • http://wwbook.org/aloha_browser_apk_uptodown0zr7s.pdfIn PDF document text
    • https://cdn.sqhk.co/savujegu/4kier13/spinach_artichoke_dip_crock_pot_pinterest.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD083 4988 bytes
SHA-256: eb8a414084e1db6a7cbd19d9c149ab7711dd001acee2523aefb0df83b095706a
font_01_sfnt_off0000e166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE166 9880 bytes
SHA-256: b1806880c5a9ca68e608b7272af34d181bbc519b0309e66ea6b09cd86a16e0a3
font_02_sfnt_off00010377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10377 16076 bytes
SHA-256: 9d161d6e34f835aff196e226d852edde4d65b072a4902c32411b177d8c29261e

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