Malicious PDF — malware analysis report

Static analysis result for SHA-256 551479bc107a0470…

MALICIOUS

PDF

105.8 KB Created: 2020-11-27 12:04:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4010e61eab371a913ab414530cb8a146 SHA-1: 902b4922635e56da4b462d6e54dedbd726636731 SHA-256: 551479bc107a04700a371e8ff39e06fca8c987d52f5303280237319cba377032
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 0.9990

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://trafffe.ru/strik?utm_term=mountain+silversage+farming+classic+winterspring PDF link annotation
    • https://gedaxafi.weebly.com/uploads/1/3/4/3/134340736/vurobavalep_bazedibewa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371269/normal_5f89265d5467c.pdfIn PDF document text
    • https://gasipepimajut.weebly.com/uploads/1/3/4/3/134367512/nasakeguwa.pdfIn PDF document text
    • https://kesevaze.weebly.com/uploads/1/3/1/3/131383297/5679298.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384145/normal_5fae9b60cbf27.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/ad3bbaea-afcb-4ec8-bd6e-b71be4f94d2a/gunejojeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/955a8801-7b94-4b92-a0e9-d3a7e6123bea/mtg_arena_draft_tier_list_war_of_the_spark.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/wolosuzakasunuxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f8f3168-5a5c-46ba-8746-27bc11c32563/jadesalalunudunejotene.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/costco_apple_pie_nutrition_information.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000141d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D8 5492 bytes
SHA-256: 9f9a1a1cee992cc88be12759292b49e547a1c80d9462ff3f8420d66a0e237912
font_01_sfnt_off0001549b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1549B 10524 bytes
SHA-256: 146712730a8bbed196416ecbd2509673f9811e245ca11c100e1160fc25ab6960
font_02_sfnt_off000178d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178D6 20496 bytes
SHA-256: 704e8ff39f47a5989b15ee2ba78f8e33a7aad752eeed6cbf292af4289fab5c19

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