Malicious PDF — malware analysis report

Static analysis result for SHA-256 6add99f291311ada…

MALICIOUS

PDF

73.6 KB Created: 2021-06-04 17:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 9afb391f2bc77141cd3e7a084727ca11 SHA-1: f5aaa5f83a6e99b141d766657013f0c3fbdc9887 SHA-256: 6add99f291311ada92783dced6b24886fdb04b4030a02007d400f6d9bfb81ebf
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of external links, many hosted on disposable domains, suggesting it is part of a link farm designed to manipulate search engine results or redirect users to malicious content. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

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://wastran.ru/pbw?utm_term=ticker+tape+lab+acceleration+due+gravity PDF link annotation
    • https://lemabifi.weebly.com/uploads/1/3/4/3/134319461/morabozawarebori.pdfIn PDF document text
    • https://wofinomedek.weebly.com/uploads/1/3/4/1/134108675/xifaroda.pdfIn PDF document text
    • https://jimazakogise.weebly.com/uploads/1/3/4/6/134612968/wujokavawuriji.pdfIn PDF document text
    • https://bagobizofenagex.weebly.com/uploads/1/3/4/7/134767931/nerifowasa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375889/normal_6017287d43443.pdfIn PDF document text
    • https://bosuzegenelulu.weebly.com/uploads/1/3/4/1/134131522/rifotavegovadexidil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402721/normal_603312daea160.pdfIn PDF document text
    • https://pixebekisutajud.weebly.com/uploads/1/3/0/7/130775176/zikij.pdfIn PDF document text
    • https://fixajunize.weebly.com/uploads/1/3/6/0/136051507/gagewol-julat-vipukajajuwiri.pdfIn PDF document text
    • https://vumazilizulorap.weebly.com/uploads/1/3/5/3/135300666/vubodadamove_pibepuviw.pdfIn PDF document text
    • https://miletobe.weebly.com/uploads/1/3/4/8/134860907/domavuvegubu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bezawagiga.pbworks.com/w/file/fetch/144554799/object_dvr_dash_cam_instructions.pdfIn PDF document text
    • http://bofamawetodo.pbworks.com/f/myofascial_pain_and_dysfunction_the_trigger_point_manual.pdfIn PDF document text
    • http://dadilotofexi.pbworks.com/w/file/fetch/144501252/92571957622.pdfIn PDF document text
    • http://fulusivijomu.pbworks.com/f/tavafedogufezuweketob.pdfIn PDF document text
    • http://sujagajo.pbworks.com/w/file/fetch/144525579/84160198853.pdfIn PDF document text
    • http://visetululiv.pbworks.com/w/file/fetch/144423345/forge_of_empires_generator_2020_winter_event.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B1 5260 bytes
SHA-256: ed2299829ed8777013a376610f953d74c0aef7ee0cbcc83c607e050456b37ec4
font_01_sfnt_off0000e698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE698 10556 bytes
SHA-256: 86ceccf9015db240977d1f7e5b0914188f5836d571ba08fd8b578ac2e65f42c4
font_02_sfnt_off00010a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9C 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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