Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b2404efeac63871…

MALICIOUS

PDF

65.5 KB Created: 2021-01-06 12:45:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b470b472c45862ea67fff7043f3d65df SHA-1: 0c858c2b2cb515d7543bb2c6662f000fe02a4957 SHA-256: 0b2404efeac63871a7411599448e14a680ec8de8dc1f44f865cac73b3c0a82b2
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-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://traffnew.ru/aws?utm_term=derivatives+with+trig+functions+worksheet PDF link annotation
    • https://dodimugu.weebly.com/uploads/1/3/4/4/134483739/poxageraziwo.pdfIn PDF document text
    • https://juvarefuj.weebly.com/uploads/1/3/1/3/131398009/3105254.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389394/normal_5fbc58d2cd9b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377098/normal_5f9f02a3aed08.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421478/normal_5fe3f17e4433c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481272/normal_5fd8092c83062.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376602/normal_5f8bbe49179ad.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/woxojuxafopuv/92764077974.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/java_32_bit_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7130f4f1-6f48-431e-b871-b7d84c91689c/xamizal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe7aba83-b35d-4e7e-bfca-e0ccf628d881/pudagifubilufaxibafudef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c62455e5-1ee3-4a76-8731-b231dd2dd56e/83917281749.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed395632-8f5d-43e6-a679-b4286be8a88e/23651709747.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0f7b272-1764-45ce-b4b5-5d42314a0cfa/tachypnea_breathing_hard.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_off0000c3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B5 5328 bytes
SHA-256: 8414c8221e92b3e9dee07e9dbe31ecee4ab8e9969004eee97c0577e937efeac6
font_01_sfnt_off0000d5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F5 10312 bytes
SHA-256: 954cacc151dc0c9d7abd8ab5b4c71fc16591268c43caa1513b67d547913a7690

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