Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d113d2818932dc…

MALICIOUS

PDF

78.2 KB Created: 2021-06-03 06:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c662293db691b5116d069e9807c991e0 SHA-1: 70406e0487159ff32093ad6a79d021bc426bb079 SHA-256: b1d113d2818932dc53d21245dbb36b65b31b67a08ed3b836a84d063a21e52395
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-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://krisoc.ru/pbw?utm_term=cheatbook+database+download+for+pc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4466379/normal_600ddcb63f538.pdfIn PDF document text
    • https://wobifeda.weebly.com/uploads/1/3/1/0/131070490/solugafod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483867/normal_5fd19334bee84.pdfIn PDF document text
    • https://reravojune.weebly.com/uploads/1/3/1/4/131406269/rudederuzilumajamawo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376600/normal_5fd986185477c.pdfIn PDF document text
    • https://navanelesud.weebly.com/uploads/1/3/0/9/130969746/7977840.pdfIn PDF document text
    • https://lobumemimakagom.weebly.com/uploads/1/3/3/9/133999871/bejefifono.pdfIn PDF document text
    • https://sanupeden.weebly.com/uploads/1/3/5/9/135961416/3355048.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bezawagiga.pbworks.com/f/how_to_make_an_inventory_form_in_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d855510a-4c49-4255-b252-b5ddae4b3b73/xutawap.pdfIn PDF document text
    • http://zufogopojut.pbworks.com/f/57071296844.pdfIn PDF document text
    • http://dajodovilav.pbworks.com/w/file/fetch/144534255/57096783900.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e20e03ec-ba49-4650-8d3b-e434473e14d1/magupewov.pdfIn PDF document text
    • http://juvupumanut.pbworks.com/w/file/fetch/144521223/fifa_16_mod_fifa_21_apkobbdata_offline_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4be019c-de38-4c22-aef4-1cf6f167510c/rolanilagoxabuwezedenujaw.pdfIn PDF document text
    • http://barumena.pbworks.com/w/file/fetch/144439443/ppsspp_gold_pc_new_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04f33473-330d-43fb-aff3-c0fa9f6c011f/zirejamevitulagizakov.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF197 5444 bytes
SHA-256: 52d098215d4f0c54b2f627134af128b620f3d9f9a8a6556a67967c97239c8bbb
font_01_sfnt_off0001041d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041D 12112 bytes
SHA-256: 7dc2722a59dd2548b034db44a2acd0e377f0bd64491ed5144fe65f164d308211

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