Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fa35e7bcb5d2dcf…

MALICIOUS

PDF

61.2 KB Created: 2020-12-15 03:37:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 44da51756a4396c43b8ce2983c04a0d3 SHA-1: 2d46d63f5c22915f865313a29ebd5f19c5e384da SHA-256: 3fa35e7bcb5d2dcf654035f44c4d0b88ae4543ed2b4ee760907e257ed27aa97e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, suggesting it is part of a link farm designed to drive traffic to other sites, potentially for phishing or malware distribution. The embedded URLs and the heuristic firings strongly suggest the document's purpose is to redirect users to malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://traffset.ru/aws?utm_term=encyclopedia+of+general+knowledge+mcqs+pdf PDF link annotation
    • https://razosuxox.weebly.com/uploads/1/3/4/7/134719946/xobiragedixagi.pdfIn PDF document text
    • https://jikuvagipotax.weebly.com/uploads/1/3/4/6/134647272/sinetafefo.pdfIn PDF document text
    • https://xekijepomi.weebly.com/uploads/1/3/4/5/134508866/6748624.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393193/normal_5fba26ab2ba0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451542/normal_5fb2a8242c92d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476751/normal_5fc04c4182bd0.pdfIn PDF document text
    • https://zavebunerug.weebly.com/uploads/1/3/4/3/134358754/felafur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377656/normal_5f93f09064999.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369498/normal_5f898309dc9bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368219/normal_5faa47ecdbe5a.pdfIn PDF document text
    • https://puzalanenezow.weebly.com/uploads/1/3/4/6/134693659/lokaxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372080/normal_5f8a585289a19.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae508e99-56d8-4298-b62c-0de1bb32ba0f/35496422167.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_off0000b119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB119 5816 bytes
SHA-256: f0d6efcf3033ca9abb3bc50a709b1ba66f4f10729e7b3bca0283b0aee1c0d343
font_01_sfnt_off0000c4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F5 10348 bytes
SHA-256: def5b14f64fbdc8eabe619e6d9d371266cd244a96d103512f2b3f5a369fa8ab0

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