Malicious PDF — malware analysis report

Static analysis result for SHA-256 b109f15315a438f1…

MALICIOUS

PDF

71.9 KB Created: 2020-11-16 19:24:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 2896a5d1845afd05030673cec398a32d SHA-1: 43217442be997490969030c73087a0e45f2cdcc3 SHA-256: b109f15315a438f108a877bdc1bcdc726fa6e829915d6077b02390964b2ffcd6
156 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm or SEO spam, directing users to numerous external PDF files and websites. The primary lure appears to be 'best oil blotting sheets for oily skin', suggesting a phishing or deceptive content distribution scheme. The presence of multiple external links and the ML classifier's high confidence score indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wb?keyword=best%20oil%20blotting%20sheets%20for%20oily%20skin PDF link annotation
    • https://kakawugob.weebly.com/uploads/1/3/0/9/130969990/7014605.pdfIn PDF document text
    • https://xafafiseroferop.weebly.com/uploads/1/3/4/5/134525648/6518551.pdfIn PDF document text
    • https://panirosarukiza.weebly.com/uploads/1/3/4/1/134132539/sugijuvekorex.pdfIn PDF document text
    • https://giboramogu.weebly.com/uploads/1/3/4/6/134627050/purakaj.pdfIn PDF document text
    • https://zokunokakepano.weebly.com/uploads/1/3/4/3/134353677/vefewusudeguv_rorag_reteronozew_rulopulavu.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/bevarolimesale/behind_blue_eyes_guitar_chords_and_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d10b60f-6919-48a5-8235-6700ac6a53f4/skyrim_live_another_life_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35035afc-9224-4a9d-b620-46418f01e422/41596947948.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85421bfc-6e79-4a19-8b4d-6422d5b7bbf7/68790082763.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c224b3a-583a-48f6-9ca4-925e5bf5c0ca/wixesizizixudurejoparuxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce011eef-2044-46a7-9c83-18d9296aeb18/vegan_potato_recipes_allrecipes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06e72aaf-ce59-4526-a037-ed3a0dd8660f/48130987198.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74dae8f5-7c7d-4efa-9887-39512a9a4cbb/44163802576.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d87a3b2-aba6-4685-b54f-36c2db26f1fc/shopping_guide_cornish_maine.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_off0000daff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFF 5172 bytes
SHA-256: af4de0e0970232abaf03d54acb5c2b5c9cb9623e4ac988a24520fc6f08c81226
font_01_sfnt_off0000eca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA5 11188 bytes
SHA-256: 769979c41d8e049c14e899b4b5f34a1fc69565f9d483ce6a0c2f381426e3fa12

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