Malicious PDF — malware analysis report

Static analysis result for SHA-256 d11f34627ff57ce4…

MALICIOUS

PDF

79.1 KB Created: 2021-03-16 08:28:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8c389bbe99cb2ef82a1ce6745b519ed3 SHA-1: a741f3a5ce1885158df58f2118cdb2068d9728a5 SHA-256: d11f34627ff57ce46f37c28396e151f71b451662435c49521986fe456965b5e4
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to attract users searching for game downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware sites. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/wix?keyword=gta+v+mobile+android+apk+obb PDF link annotation
    • https://danexuxubusam.weebly.com/uploads/1/3/2/6/132695747/4a488ea2001c.pdfIn PDF document text
    • https://dedopaka.weebly.com/uploads/1/3/4/4/134498192/4252250.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484610/normal_601063376b084.pdfIn PDF document text
    • https://rejonogatu.weebly.com/uploads/1/3/5/3/135392998/fanigowub-zobokiw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471945/normal_5ffe930b806fb.pdfIn PDF document text
    • https://pukutititoj.weebly.com/uploads/1/3/1/3/131383613/tatujunufuvope.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484097/normal_604c9ddb1e2a7.pdfIn PDF document text
    • https://xowonijateroz.weebly.com/uploads/1/3/1/3/131380337/e43412c86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446168/normal_601cfb0b75b61.pdfIn PDF document text
    • https://fiwobezamarevev.weebly.com/uploads/1/3/2/7/132740324/vuveko.pdfIn PDF document text
    • https://kilizilefepik.weebly.com/uploads/1/3/0/7/130775254/97c09b89e063f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467926/normal_60386af5285f8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9475b3c7-4319-4113-be31-b4deb2df3bf8/11738143717.pdfIn PDF document text
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_145791f3393f4561882b6f81b9ceb1bc.pdf?index=trueIn PDF document text
    • https://621cd70f-1aca-46de-91df-1bd8162c3e90.filesusr.com/ugd/9f1ad6_66a2d9114ba4452d950772611342fe1c.pdf?index=trueIn PDF document text
    • https://a9f3490c-def6-45ea-9957-aefa341d54bd.filesusr.com/ugd/84b587_4df36d37550f455dba7cd1f3c17af3fb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/066f0459-e916-40d9-9fcf-c423fa8a8508/why_isnt_my_dishwasher_getting_my_dishes_clean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/748d0408-1586-4592-99ac-a91d9e9f2488/how_to_thread_a_301a_singer_sewing_machine.pdfIn PDF document text
    • https://ad843f61-c544-48d7-8cfb-3c048b9edb46.filesusr.com/ugd/0dd9ed_097fc8ce47374b6b8a55f8e3d107946b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c36ad6c6-cc82-48e5-8762-fee3f5dfc173/what_are_the_different_types_of_contrast_medium.pdfIn PDF document text
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_cd8b32fcf9184a03a5323d0a7bd724d0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac800449-5bd9-4b88-bf5d-5572d0e2bbf5/zeboworadurop.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_off0000f762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF762 5220 bytes
SHA-256: b98939f7e319c11ce39228611184c13c3103fbf9c83271791d35c5b7508de0cd
font_01_sfnt_off00010912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10912 11088 bytes
SHA-256: 0f8ee7a2c2f45457e69d29902458d54a25b6caa4ac04d478d21c52c7f49433ca