Malicious PDF — malware analysis report

Static analysis result for SHA-256 661e4b1d09a5cbde…

MALICIOUS

PDF

70.7 KB Created: 2021-01-01 09:54:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 9778f4f442f04557b9782e84c399d0d3 SHA-1: f73ea0c475a1624b3fbffa26b7a097d20d8e21ee SHA-256: 661e4b1d09a5cbded12b9556175fd4015fa1640918b750260eeeb270dff69777
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a significant number of external links, identified as a PDF SEO link farm, which is a common tactic for distributing malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving exploitation to redirect the user to one of the numerous linked URLs. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://trafffi.ru/123?utm_term=106+and+park+top+10+countdown+2005 PDF link annotation
    • https://tuxitusonodedin.weebly.com/uploads/1/3/0/8/130873989/similani.pdfIn PDF document text
    • https://butadagawonor.weebly.com/uploads/1/3/1/0/131070306/5076552.pdfIn PDF document text
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/9210765.pdfIn PDF document text
    • https://maladekokox.weebly.com/uploads/1/3/4/7/134745457/bitutuxakupobiwevuwa.pdfIn PDF document text
    • https://cdn.sqhk.co/daxegajok/gihMgde/hero_wars_tier_list_yasmine.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450426/normal_5fd14d5cbdf41.pdfIn PDF document text
    • https://vavetoros.weebly.com/uploads/1/3/4/8/134854671/ramaletekeli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369786/normal_5f87de504dc9b.pdfIn PDF document text
    • https://suvewuvasalu.weebly.com/uploads/1/3/4/7/134762181/duvoxusa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/cancer_woman_pisces_man_yahoo_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/88952500208.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/gawain_5_suriin_natin_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/fefusegigutovixino.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/novaf.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_off0000d3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B3 5520 bytes
SHA-256: 817ffc70a0ef32a4fd957cc8aa00dc0997177e1ab070d0edee762ebf0de867b6
font_01_sfnt_off0000e6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AA 11900 bytes
SHA-256: 040b17c147ade2a58bbb150966002e6b333e853a32af2570ae46db571cc87272

Open this report in the interactive analyzer, or submit your own file for analysis.