Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f928f460a8a3213…

MALICIOUS

PDF

67.6 KB Created: 2020-12-16 10:04:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4a9e0210d6cac634e93409b8504617ed SHA-1: b97010939581c1bc6dcadefa852b01c47a696770 SHA-256: 7f928f460a8a3213cacf2b99a72c3a38a045090f5040b14e2b0f043ee717068b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous 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 phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9834

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://traffset.ru/strik?utm_term=makita+die+grinder PDF link annotation
    • https://zumofimuletoxol.weebly.com/uploads/1/3/4/0/134018509/6eac18634.pdfIn PDF document text
    • https://jibokogemi.weebly.com/uploads/1/3/4/7/134767321/semilegegag-mavadisizives-zewawu-sopezemo.pdfIn PDF document text
    • https://duxoberadu.weebly.com/uploads/1/3/4/7/134718286/b46934f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414487/normal_5fbd4b2aeb5ff.pdfIn PDF document text
    • https://lupuxamugegudi.weebly.com/uploads/1/3/4/6/134623484/kexoxenawutiromo.pdfIn PDF document text
    • https://pigukoziluluz.weebly.com/uploads/1/3/4/8/134896600/ronojonaguvofojape.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386095/normal_5fd0988c61496.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
    • https://s3.amazonaws.com/penefelomiju/battery_calibration_tool_android.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/94571071830.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3264af9b-05be-42a2-9558-a61495c2bed8/duvesufogi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d999def-b5a5-4775-89f9-18be4f83512d/dexorezamu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/540f044e-2543-4e57-8019-672be3c9da70/85591728765.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a3e1b7f-de2a-4b4f-a545-8f0a81b0ebb7/53412963382.pdfIn 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_off0000ccf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF8 4532 bytes
SHA-256: 6b070624dde93cab44721aba08f8c4c3d7d3462088ca846f86f94489d5748aa2
font_01_sfnt_off0000dc65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC65 10676 bytes
SHA-256: a0c2ad00e14045549fe03b757d18db012d554aba4314c559a1172ca6cec7b29b
font_02_sfnt_off00010095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10095 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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