Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfcd7a42d1fea4e8…

MALICIOUS

PDF

77.3 KB Created: 2021-04-18 18:40:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11ce9ee9eb0bafdc356dd3fa51b6807b SHA-1: 5499bc8ca64fa0c44b13647e271bfaa439a4a35f SHA-256: bfcd7a42d1fea4e839be85905cc68326d6d01b548e23015a7cc532dd920c904b
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML heuristics confirm its malicious nature, likely as a phishing or trojan distribution vector. The embedded links suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://seumenha.ru/strik?utm_term=how+to+create+a+career+progression+plan
    • http://nipizakevenuvis.scienceontheweb.net/zesizujaludigimebiwiwit.pdf
    • https://kapuwibipu.weebly.com/uploads/1/3/0/9/130969563/e44eb7ce.pdf
    • https://cdn-cms.f-static.net/uploads/4383692/normal_605952732995b.pdf
    • https://tiguziriwisil.weebly.com/uploads/1/3/1/0/131071210/gajevoladinax.pdf
    • https://static.s123-cdn-static.com/uploads/4420592/normal_6005c850b010b.pdf
    • http://jebonefawudo.sportsontheweb.net/cryptocurrency_free_download.pdf
    • https://static.s123-cdn-static.com/uploads/4383475/normal_5fccc98bb48b2.pdf
    • http://luziniwanemek.sportsontheweb.net/equilibrio_ionico.pdf
    • https://dobamadolexazi.weebly.com/uploads/1/3/4/4/134478964/8403fb934d1ca.pdf
    • https://tafivemusuwivik.weebly.com/uploads/1/3/5/3/135322605/xisosaj_topetetujewux_viwukibe.pdf
    • https://mejebepagomuda.weebly.com/uploads/1/3/4/4/134494428/mipuwoxubu_pufejuvixuw_fivaxasaji_kinerovetoza.pdf
    • https://motubisirewu.weebly.com/uploads/1/3/4/5/134529252/aee1e.pdf
    • https://cdn-cms.f-static.net/uploads/4380540/normal_6015f18ab4539.pdf
    • https://cdn-cms.f-static.net/uploads/4451228/normal_606211b17e053.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e29a9437-b0a5-48a6-9afa-908397ce514a.filesusr.com/ugd/16a9c1_d665a67022b948a292809daaed64fa69.pdf?index=true
    • https://s3.amazonaws.com/fomaralunex/matulumib.pdf
    • http://falariwupap.myartsonline.com/64282402803.pdf
    • https://4e4608fd-868e-43f5-b6ba-14e5e4b50785.filesusr.com/ugd/b1f235_f6b5008fac2b465eb39b1e59c1a9efe3.pdf?index=true
    • http://kofaxafogi.myartsonline.com/vogubusuvokoneb.pdf
    • https://3926d074-74ab-41cc-aa9d-340192ccda4e.filesusr.com/ugd/5619e7_5eaee9b85040441297d24edde4da641d.pdf?index=true
    • https://s3.amazonaws.com/jeduzizonox/jusagizuzunipo.pdf
    • https://0c2a99dd-71fd-4a0d-b96f-672cfa785c21.filesusr.com/ugd/515c54_40ded6a5932a4de2bd9fdda9a0ac6320.pdf?index=true
    • https://ccd4a2e6-63e2-4dcb-a02e-1ae1253dabcc.filesusr.com/ugd/059ff1_052c95a07d3f4e9c80c7ebcaf55291d4.pdf?index=true
    • https://s3.amazonaws.com/bejenosugede/6206809087.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1b2.bin
51fd0f22501caa4a673ea084f58564ffadcf5621832f4d5df37a282600d7ad0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B2 5156 bytes
font_01_sfnt_off0001035f.bin
97af276a9dda7a4ba58b58c737b6c243d6b52d5e897373ccb3e4dfa27bd12874		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1035F 10632 bytes

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