Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9ea6f0de3e7ed3f…

MALICIOUS

PDF

85.0 KB Created: 2021-04-29 21:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: bf3ff764f0ee6b5b4080006c9b78e799 SHA-1: 959a64b637876c003c2a89c903269a459ec951e1 SHA-256: b9ea6f0de3e7ed3faf0577814fb1f4efa430e90dec3c00e0a0e666c2ad01e34b
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common tactic to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/strik?utm_term=personajes+del+capitulo+1+cronica+de+una+muerte+anunciada PDF link annotation
    • https://jajaleregonu.weebly.com/uploads/1/3/4/2/134235513/patupilojelefu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386834/normal_5fde346069c00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420430/normal_605e13a65b742.pdfIn PDF document text
    • https://vonepegoparopew.weebly.com/uploads/1/3/4/3/134352316/vugemewikogek.pdfIn PDF document text
    • http://kabakotunaze.iblogger.org/a_level_biology_practical_notes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391642/normal_5fdb3cfa00f56.pdfIn PDF document text
    • https://mewasopaligesar.weebly.com/uploads/1/3/1/4/131454012/2099100.pdfIn PDF document text
    • https://nuvuxupu.weebly.com/uploads/1/3/4/5/134507381/0df355.pdfIn PDF document text
    • https://fegoluxojelab.weebly.com/uploads/1/3/4/4/134490239/vuvebazezob-pofatomejitar.pdfIn PDF document text
    • http://tojukuw.iblogger.org/65218049690.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470537/normal_604ce5b514f76.pdfIn PDF document text
    • http://jumufedug.22web.org/67246686272.pdfIn PDF document text
    • https://mitapesazo.weebly.com/uploads/1/3/4/6/134652839/9597583.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sokexodine.rf.gd/83266059864.pdfIn PDF document text
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_631957d41be748edad4a4389de5f9f9b.pdf?index=trueIn PDF document text
    • http://jevigoxiferoka.epizy.com/calculate_affine_transformation_matrix_python.pdfIn PDF document text
    • https://95a83a18-022f-4aa5-9dc2-588eac4c5c4a.filesusr.com/ugd/ccb6ab_e68a6022021a4284bfc514e5f8fafcb2.pdf?index=trueIn PDF document text
    • https://3df06c22-1e8a-4082-8cc2-a0fdc0609706.filesusr.com/ugd/d86e81_0d12ce8da3974a9db0d7659082a4feec.pdf?index=trueIn PDF document text
    • http://vaguxupinirulop.epizy.com/favigewiw.pdfIn PDF document text
    • https://76bf09fe-c378-4d6f-baa9-beaf48595a8b.filesusr.com/ugd/61567a_52befc2d5f194f778d1a550a0f47d895.pdf?index=trueIn PDF document text
    • http://buxozininexe.epizy.com/wemurewojizasere.pdfIn PDF document text
    • http://fopujokites.rf.gd/ronozulafofewugesuvi.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_off00010a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A91 5348 bytes
SHA-256: b2ed8b86bec5706ea80c141d8d52e71ddce4f5d4a412a9d4a05aee7981622af1
font_01_sfnt_off00011cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB6 12388 bytes
SHA-256: d6385be72755f176334c53f77c6bcdb64475f89c3a177bc798e96f4d5c88ddf1