Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f4177fa936b0524…

MALICIOUS

PDF

74.7 KB Created: 2021-05-20 01:36:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 71a7f26ad64da7a5501cdc84d743fcfa SHA-1: d8a8b9bd98b370eeab06b14cc22180dbd5c0dc4f SHA-256: 0f4177fa936b05249a9ce0ff34482ee3f9140a99fe0b64369a000d07211cd24f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://fokemale.ru/strik?utm_term=los+alegatos+de+apertura+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4462073/normal_600aebd268de8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490364/normal_605a121d0f154.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374860/normal_6020fb65ac0b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427799/normal_5fe8ac5235ee3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403407/normal_5fff457181490.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381302/normal_5fe659311a882.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476924/normal_605bfd382d69d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426812/normal_603cf5437040d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374360/normal_606d65d3ee117.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454300/normal_603422d1bf474.pdfIn PDF document text
    • https://gubizotalu.weebly.com/uploads/1/3/1/8/131871644/6035526.pdfIn PDF document text
    • https://sadavofabuloxus.weebly.com/uploads/1/3/5/3/135316226/9788600.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415930/normal_604ed2ee8b0da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491925/normal_604989527bcaf.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/36fd1b15-71c3-4233-b068-b352df09a2da/jiwowov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/add5f9b0-7a29-4f18-b9b9-7752529df0d5/molozunolilaxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b60535fa-6cd6-4864-ba24-e6852f4b857e/wizards_of_the_coast_mtg_kaldheim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fcae0b1-4cdf-40b4-89a7-bafba9054f14/rasomejejijulewuligugax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84006e28-1bd3-46cf-ab43-fbe1f96142b2/sokidati.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B4 5152 bytes
SHA-256: 3c3ad5ea914de56008089530b9478c302944c3c35fd01e0b067a69e94463c449
font_01_sfnt_off0000f74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74F 11384 bytes
SHA-256: 3ae7cd9cb0ebb1a41009aa22ce7354121e2aa66a482ac713eb35d78569592fa1

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