Malicious PDF — malware analysis report

Static analysis result for SHA-256 16780efb0f0739ab…

MALICIOUS

PDF

75.4 KB Created: 2021-01-25 13:09:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 9bebd18fa60cd1009efe2b554a3a0f30 SHA-1: e3edfefe376c366c34b104d4d1c9eae1c1acbdef SHA-256: 16780efb0f0739ab0b328960cbdb427407a8e53ab6aa268b0ef49cf775ef3a31
246 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing and remote-support lure. It contains a large number of external links, many pointing to disposable hosting services, suggesting an attempt to distribute further malicious content or redirect users to phishing sites. The presence of remote-support and callback lures indicates a social engineering tactic to trick users into installing unwanted software or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://traffine.ru/123?utm_term=smart+guide+to+the+bible+proverbs PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387232/normal_5fe678da6dda9.pdfIn PDF document text
    • https://lufiwusogak.weebly.com/uploads/1/3/4/3/134319395/fipuvupog_xowekizotubivog_vejaw_gegevusori.pdfIn PDF document text
    • https://cdn.sqhk.co/jepipovi/Phaiehc/smart_charge_iphone_cable.pdfIn PDF document text
    • https://cdn.sqhk.co/bitenutugiw/l0IUgic/56183417449.pdfIn PDF document text
    • https://cdn.sqhk.co/vatuliwa/ihUggig/download_brave_frontier_2_mod_apk.pdfIn PDF document text
    • http://coins24h.com/my_airtel_app_download_sri_lankaliqsi.pdfIn PDF document text
    • https://cdn.sqhk.co/pufowuvikij/icFrpii/25682323039.pdfIn PDF document text
    • https://rogapunuki.weebly.com/uploads/1/3/4/3/134375427/wemepudaz.pdfIn PDF document text
    • https://cdn.sqhk.co/lipetebo/RAwOTge/best_school_app_for_parents.pdfIn PDF document text
    • https://cdn.sqhk.co/febowozefu/hiuhbjg/vusuranemugefolu.pdfIn PDF document text
    • https://toxedozopofezi.weebly.com/uploads/1/3/1/4/131453782/7594882.pdfIn PDF document text
    • https://cdn.sqhk.co/fafaviwi/aidjg1M/english_language_arts_reading_comprehension_grade_5.pdfIn PDF document text
    • https://cdn.sqhk.co/vujagefamig/gh8gcgf/pijokinibu.pdfIn PDF document text
    • http://contact-git.top/wavomesuzekoliwudutolo747ty.pdfIn PDF document text
    • https://cdn.sqhk.co/daxegajok/gDie1AZ/tavuwowiwogezixotilel.pdfIn PDF document text
    • http://car-test.pro/hello_sharechat_videom0y9k.pdfIn PDF document text
    • https://cdn.sqhk.co/guxuboru/ClggJY7/teamviewer_quicksupport_download_play_store.pdfIn PDF document text
    • https://dolevepi.weebly.com/uploads/1/3/4/5/134587457/902326.pdfIn PDF document text
    • https://lofuniwap.weebly.com/uploads/1/3/0/8/130874201/movevipixibovazes.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F6 5676 bytes
SHA-256: 6db3391684653f2974fda911e6383154c573d0ed8d40e709e6265304de764e2f
font_01_sfnt_off0000fb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0D 10888 bytes
SHA-256: 632011c6436efda139e3190e7e4a1bd6194c2f30766ad0092d26b680b86fe490