Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3a8696f9943cba6…

MALICIOUS

PDF

76.5 KB Created: 2021-03-23 06:10:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 95120a2fe727278a3089bc5d3a644d10 SHA-1: 91d3d88bfb1ea4b66e01fa31f46fad4eae403d53 SHA-256: d3a8696f9943cba60e7948836f53c069e36f2833efd02f1f0a10a8b4179b29a4
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing a large number of external URIs pointing to various domains. The ML classifier and ClamAV also strongly indicated maliciousness, with ClamAV identifying it as a phishing trojan. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, which aligns with the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/123?utm_term=bloodstained+familiar+guide PDF link annotation
    • https://pojekemo.weebly.com/uploads/1/3/4/4/134469054/gofixekafapofe_wuraf_bosufol_jufifimufulilo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446651/normal_604e239aaa571.pdfIn PDF document text
    • https://gimazujik.weebly.com/uploads/1/3/4/2/134235519/miwamedu.pdfIn PDF document text
    • http://creditstar-kabinet.com/do_teeter_hang_ups_workmrahp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446651/normal_604fdc6e708d1.pdfIn PDF document text
    • https://daxixerok.weebly.com/uploads/1/3/4/0/134000062/3e25c3f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425256/normal_603be63861a6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447436/normal_6001f553b44d6.pdfIn PDF document text
    • http://snail-case.store/punerewomexumujetemah0yey.pdfIn PDF document text
    • https://vedakevuvapi.weebly.com/uploads/1/3/4/0/134013486/e18d58.pdfIn PDF document text
    • http://sait-ok.ru/52945872048i3iza.pdfIn PDF document text
    • http://vodabutopidaru.getenjoyment.net/facebook_device_code_login.pdfIn PDF document text
    • http://xufelaketodo.getenjoyment.net/musab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366659/normal_600fed80a52e8.pdfIn PDF document text
    • https://fekanarikivokil.weebly.com/uploads/1/3/4/8/134884633/fidaluzef.pdfIn PDF document text
    • http://sfhgfje5df.xyz/tuxexozobikitav8rey.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zasuwunal.myartsonline.com/zovanega.pdfIn PDF document text
    • https://5862e4ea-63a6-4c92-af93-e06d02d1a664.filesusr.com/ugd/eaa371_0dc8da2a963b4186a3eceb91627180a9.pdf?index=trueIn PDF document text
    • http://pejemevogoge.myartsonline.com/45092968135.pdfIn PDF document text
    • https://12a3aa02-022d-4218-8efb-90aa4388683d.filesusr.com/ugd/6dfd9b_9dc8895868634aba8128089bc45a1da9.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_off0000efc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC8 5276 bytes
SHA-256: 93847b7ce32f863ea304553560fb0466685bdef0410296807c8face9bdc5515e
font_01_sfnt_off000101a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A8 10340 bytes
SHA-256: 4f8993599e980339bdf801e36c815ff38f61f61d727a3330f1b2aac769ccf4be

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