Malicious PDF — malware analysis report

Static analysis result for SHA-256 24777e04d2c9b610…

MALICIOUS

PDF

84.6 KB Created: 2021-03-15 10:44:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 5e16d1f50b2699e96d67cd7e1944678f SHA-1: 533572fd6afed7c214d6b406e0c1252037087a42 SHA-256: 24777e04d2c9b610eb79385b0b885a50862329b342f3aa06d4e6f4f6dd0e63a3
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. While no scripts were extracted, the sheer volume of external links and the detection results point towards a malicious document, likely intended to lead users to malicious sites or to manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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 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.
  • 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://leonvi.ru/123?utm_term=bluetooth+backup+camera+android+tablet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486971/normal_60349006cad17.pdfIn PDF document text
    • https://zavetogodafewer.weebly.com/uploads/1/3/4/7/134709275/8559330.pdfIn PDF document text
    • https://bebibamo.weebly.com/uploads/1/3/1/4/131438385/7162522.pdfIn PDF document text
    • https://jaxedafotonomut.weebly.com/uploads/1/3/4/8/134885779/gipepunu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494451/normal_5feb73b3ae0c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447877/normal_602d9cec5d2e3.pdfIn PDF document text
    • https://mitojebani.weebly.com/uploads/1/3/2/7/132711961/jijedi-jurabukodowasa-topatotojilob-nuriropenu.pdfIn PDF document text
    • http://kunepuvobimamin.medianewsonline.com/bevozipudumewiduwamovino.pdfIn PDF document text
    • http://kovatafob.mypressonline.com/quadrafire_pellet_stove_insert_parts.pdfIn PDF document text
    • http://dewexipe.22web.org/xanokawixigaderone.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/sifunewevipuwaw.pdfIn PDF document text
    • https://jobalexaxikut.weebly.com/uploads/1/3/4/8/134892204/259d7e354e13c09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452372/normal_603c468cf342f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413838/normal_6041e6710de48.pdfIn PDF document text
    • https://tezefidusipenu.weebly.com/uploads/1/3/1/8/131857758/8873670.pdfIn PDF document text
    • https://lavefikamov.weebly.com/uploads/1/3/0/8/130813740/143600.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mamesejo.epizy.com/unterschied_beats_solo_pro_und_studio_3.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/tutti_i_complementi_dell_analisi_logica.pdfIn PDF document text
    • http://vowojuxibaxo.myartsonline.com/ignition_system_troubleshooting.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/24317745525.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/76253515945.pdfIn PDF document text
    • http://jekurur.atwebpages.com/10610877919.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/65784230130.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD9 5388 bytes
SHA-256: f8eacdc9429c472b26b69d32bbcea6c05b0c1c4c80179816c5ea68cd85340e73
font_01_sfnt_off00011cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF6 11500 bytes
SHA-256: d513a3952ad08460dfdd1f11ce1a902c8bf8a82b8cffdf806f8a908a8adcdde0