Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbaea81d02c775cd…

MALICIOUS

PDF

87.9 KB Created: 2021-02-26 08:18:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: c4f3f3f0d9e38d3cbdc40c25fed80c17 SHA-1: a358164309bf0da6b82d024e12ce3fbb1b3e2c82 SHA-256: cbaea81d02c775cdce9409b95e6cb73b6c64a46deba641b1c9ea3ec5e2f300b3
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 hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://jottigo.ru/strik?utm_term=how+to+open+front+of+whirlpool+cabrio+dryer PDF link annotation
    • https://gugibutuxu.weebly.com/uploads/1/3/2/8/132814167/koburomebudo.pdfIn PDF document text
    • https://xosenevofas.weebly.com/uploads/1/3/5/3/135324499/kogesodezibenevomip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462976/normal_6019d9e4a9780.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392463/normal_601c03b1454d6.pdfIn PDF document text
    • https://cdn.sqhk.co/gidenateg/qjjz53s/pottery_artists_names.pdfIn PDF document text
    • https://cdn.sqhk.co/mepowokugo/jcdRhhw/car_stick_shift_covers.pdfIn PDF document text
    • https://xofeboje.weebly.com/uploads/1/3/4/5/134584890/9064986.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366351/normal_601fe3e30056f.pdfIn PDF document text
    • http://legivupipofu.66ghz.com/98717987468.pdfIn PDF document text
    • https://cdn.sqhk.co/lunosupi/fGoifWq/47519531226.pdfIn PDF document text
    • https://cdn.sqhk.co/vabalogu/2Bichb7/45081832606.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454984/normal_5fe52c2e7319c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485702/normal_5ff51d8884fa3.pdfIn PDF document text
    • https://cdn.sqhk.co/sedazozesufu/cgGZ7he/top_10_funny_cricket_videos_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455178/normal_5fd645b0a9d55.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gabitotedusaled.epizy.com/epson_wf_2630_non_riconosce_cartucce_compatibili.pdfIn PDF document text
    • http://vasedazixi.rf.gd/power_hand_tools_safety_guidelines.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E38 5148 bytes
SHA-256: b8bbbd269b1c54243d6364e2eb6d506a5e7539a5677f36f245ac50c23f40f499
font_01_sfnt_off00011fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB6 10644 bytes
SHA-256: 5e6d9b55cd18b820d2695d1a3b09a70745adfcc35669f7eeac65db9e19e507b9
font_02_sfnt_off0001441b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1441B 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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