Malicious PDF — malware analysis report

Static analysis result for SHA-256 87690a908f59d272…

MALICIOUS

PDF

78.5 KB Created: 2021-01-09 07:44:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: c4c9a9c1a44ae734e52ff578764eb42d SHA-1: e85a6c2af010d45f40af67c1e3e2bdc06b8bbec1 SHA-256: 87690a908f59d272f3fa66a517fa421bff965abcfee211d4ab372772312a869e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious sites. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM firings strongly indicate this behavior. The ML classifier and ClamAV detection further support the malicious nature of the file, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://traffnew.ru/123?utm_term=cyberpatriot+ubuntu+answer+key PDF link annotation
    • https://ruwiwiteviporiz.weebly.com/uploads/1/3/4/7/134767377/2ee970e.pdfIn PDF document text
    • https://kamowomol.weebly.com/uploads/1/3/4/3/134371521/fesuduvib-badif-xajedezer-wonogojod.pdfIn PDF document text
    • https://lilawowawumoxo.weebly.com/uploads/1/3/1/4/131453384/810fbf551290d.pdfIn PDF document text
    • https://xabejelowubi.weebly.com/uploads/1/3/2/6/132695530/fexaxukotisip.pdfIn PDF document text
    • https://cdn.sqhk.co/sojetaji/NNggdj1/ufo_enemy_unknown_cheats_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/potiribuwuf/gcuKjjH/hotstepper_new_song.pdfIn PDF document text
    • https://kuxadolawemigos.weebly.com/uploads/1/3/4/7/134712866/5021018.pdfIn PDF document text
    • https://xexibufit.weebly.com/uploads/1/3/0/7/130739933/3091d.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/c64a74dc-2b95-4b8f-9d02-21dc9a21ceb1/calculus_pioneer_swiss.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/903d8b02-1e88-4638-b87d-a9aa8361c5ec/13214120718.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56e4d29e-a8e1-4563-85b3-3b99b980c252/nedeget.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1509c3c-8d63-462f-aa7c-1a5a24c5db3a/wosadaxegotusuxidepo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f764e1ff-bf40-4ee0-9498-00d68225a9ee/77968909842.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd6a8fe2-839a-49ec-a6c7-d1e162bc4682/1331897042.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a1d9f10-4854-4def-a79a-bf1960be5a8b/visual_studio_dersleri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecc9bfb8-afbc-4dbc-9047-c7293c9f5c75/jamituk.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_off0000f6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A2 5084 bytes
SHA-256: 68a9ce4b48b69174c46a8cb4630c48661406ed3ed00760d398f700108950913a
font_01_sfnt_off0001080d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080D 10748 bytes
SHA-256: 7965b855f2e87e8ae41d76910e8ce845bfe6270bcedba467cd8d50909b174fea

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