Malicious PDF — malware analysis report

Static analysis result for SHA-256 5767f7d08f130af4…

MALICIOUS

PDF

75.7 KB Created: 2021-03-25 06:17:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 55de3fa20f2c9927d37453ccbe5a5108 SHA-1: ebf1451be4b77a6dc8378f4d519ef47a8f92ca1d SHA-256: 5767f7d08f130af4609cc71318771be80e49ca8dcf375a3453c527cb53541250
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with high confidence. It contains numerous embedded URLs pointing to disposable hosting and link farms, suggesting a phishing or malware distribution attempt. The document body, though partially obfuscated, contains keywords related to 'clinical medicine consult pdf' and is generated by wkhtmltopdf, a tool often abused for creating malicious PDFs.

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://vilenefex.ru/award?keyword=clinical+medicine+consult+pdf PDF link annotation
    • https://kofuwirobunugob.weebly.com/uploads/1/3/4/3/134318534/rifabosodoj.pdfIn PDF document text
    • https://cdn.sqhk.co/tibidatoxo/QuicJjg/best_podcast_apps_android_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408875/normal_5ff2765e2b3c1.pdfIn PDF document text
    • http://idem-peshkom.ru/litozemuihryx.pdfIn PDF document text
    • https://cdn.sqhk.co/bujomuvi/ijLFie4/40th_birthday_cake_ideas_for_her_pinterest.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375699/normal_604b317b1cd0e.pdfIn PDF document text
    • https://cdn.sqhk.co/jabisopomuxo/hc7gfNa/used_pinball_machines_for_sale_edmonton.pdfIn PDF document text
    • https://likizosuzi.weebly.com/uploads/1/3/4/8/134886942/4b51359cdc22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386852/normal_603215cbd95fb.pdfIn PDF document text
    • https://putofikanavo.weebly.com/uploads/1/3/0/7/130738484/nufowiwusop_nitorikarur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403273/normal_6030a0aa60899.pdfIn PDF document text
    • https://cdn.sqhk.co/xukigipeduve/XOghLyI/android_fastboot_disable_secure_boot.pdfIn PDF document text
    • http://galajikimozupu.iblogger.org/74251991925.pdfIn PDF document text
    • http://rerubin.space/sewepexofili4rvc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/geraromu/formatvorlage_brief_sichtfenster.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/64217130709.pdfIn PDF document text
    • http://bidadefaj.epizy.com/91655483135.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/tixeximakolevokusa.pdfIn PDF document text
    • http://pujeriv.rf.gd/nakibajiwolajajeralokiwo.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
    • https://www.amazon.com/dp/B004I5BUACFromIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE981 5108 bytes
SHA-256: 1870a0cac62e3f010e39bbd748a7650bc20fc00e45a65ecba0a4cf1ae2d1568c
font_01_sfnt_off0000fad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD1 10952 bytes
SHA-256: 956d45ec4009e35826a9cc933def7bc7caefddbaa81ff329a385f225592157d9

Open this report in the interactive analyzer, or submit your own file for analysis.