Malicious PDF — malware analysis report

Static analysis result for SHA-256 d037b8199fce0178…

MALICIOUS

PDF

79.2 KB Created: 2021-04-11 15:31:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f6e59c7d9c74ed9caf05f89890710729 SHA-1: 2460f0131e28c0c90a8d6dd4d6e19688fd6f7c82 SHA-256: d037b8199fce0178508b2d23e84a3f772bffcb9b68f72ec9466123b4077b09af
186 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 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://lozipotod.ru/strik?utm_term=saxon+math+course+2+worksheets PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4462339/normal_604509123ca16.pdfIn PDF document text
    • https://zaketedojerobi.weebly.com/uploads/1/3/6/0/136023974/e5c586c60121ded.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484990/normal_6057b3a6d436d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426557/normal_605d788097763.pdfIn PDF document text
    • https://fevobubutexub.weebly.com/uploads/1/3/4/4/134481878/mupotokiwep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368221/normal_603b250d525fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421038/normal_604d34a68ad66.pdfIn PDF document text
    • https://fitinunajixir.weebly.com/uploads/1/3/1/6/131637477/gukofeteza.pdfIn PDF document text
    • https://cdn.sqhk.co/jinubodilev/haijc7W/dragon_quest_anime_2020_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405895/normal_5fd80ed759af8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494147/normal_5ff1cec70c87b.pdfIn PDF document text
    • https://cdn.sqhk.co/fujikapoji/didrgeE/27628093598.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420020/normal_5fd3bd44aa57a.pdfIn PDF document text
    • http://pokezokebawi.mygamesonline.org/sisakalafu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369768/normal_6020ba3e048ac.pdfIn PDF document text
    • http://gejokakop.mygamesonline.org/how_to_make_a_bridge_with_popsicle_sticks_without_glue.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f6b99bba-f064-431f-ab68-6eacb91b2703.filesusr.com/ugd/35e1ce_f04ad48097bd4e2fb51dd46b43604b10.pdf?index=trueIn PDF document text
    • https://a72a44ae-2aae-4d6a-a6c4-235301d0a62e.filesusr.com/ugd/57436b_514c43defe6445c59cc03f527414dacf.pdf?index=trueIn 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_off0000f45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45A 5468 bytes
SHA-256: 7620b077e7092c8c75e8fdc9a9ae8297b5f3b766cc2474ed16e49ac882d8c94a
font_01_sfnt_off000106dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DD 11396 bytes
SHA-256: e5710be836d3833ebe1a9c81a165eee5bf42cbbef4c6177305c9833d638be1cc

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