Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e4c44f5c6679a94…

MALICIOUS

PDF

91.0 KB Created: 2021-03-14 05:39:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 158a6a1f0eef91cd72dd4bbf97d85c95 SHA-1: 77dc6416d63b7c00856a2c83a0770f9f1a528878 SHA-256: 8e4c44f5c6679a9419f757043022423b0c3cdefe91fd0222b77294d0b8718fb4
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external links to other PDF files hosted on various domains, with a significant number of these links pointing to disposable hosting. This behavior is often associated with SEO spam or distributing further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://maypoin.ru/123?utm_term=que+es+el+antigeno+prostatico+especifico+pdf PDF link annotation
    • https://bemetapijulew.weebly.com/uploads/1/3/1/4/131437656/mefiregazijuvoze.pdfIn PDF document text
    • https://litizabege.weebly.com/uploads/1/3/4/7/134713043/vinuliwuso.pdfIn PDF document text
    • https://luwojasog.weebly.com/uploads/1/3/1/3/131380471/7556352.pdfIn PDF document text
    • https://wexejapu.weebly.com/uploads/1/3/1/3/131384175/b50ecfec838b699.pdfIn PDF document text
    • https://powelogub.weebly.com/uploads/1/3/1/8/131871449/jivobikijire.pdfIn PDF document text
    • http://lisuzigerob.mygamesonline.org/grade_9_spelling_words.pdfIn PDF document text
    • https://karadirivesu.weebly.com/uploads/1/3/1/4/131407010/xoxekemupojetatigur.pdfIn PDF document text
    • https://susulipazelavig.weebly.com/uploads/1/3/5/3/135335994/2609183.pdfIn PDF document text
    • http://malanefire.sportsontheweb.net/prepositions_exercises_for_class_5.pdfIn PDF document text
    • http://faripofijukevom.mywebcommunity.org/brutal_dog_fights_caught_on_tape.pdfIn PDF document text
    • https://jokinurelebuvet.weebly.com/uploads/1/3/1/8/131856462/zisetenavu.pdfIn PDF document text
    • http://vajukadezazi.getenjoyment.net/7293509027.pdfIn PDF document text
    • https://senamevab.weebly.com/uploads/1/3/4/6/134689233/jezegogik.pdfIn PDF document text
    • https://karegito.weebly.com/uploads/1/3/4/6/134626514/pipawe_lapegi.pdfIn PDF document text
    • https://fibumexil.weebly.com/uploads/1/3/1/0/131070733/majegofiwi.pdfIn PDF document text
    • https://lejoleguje.weebly.com/uploads/1/3/1/0/131070186/2502123.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mobukug.myartsonline.com/tawitet.pdfIn PDF document text
    • https://c18d7360-3707-4bf1-9d6f-52ba7510fa17.filesusr.com/ugd/76cb06_f2f0dd950c6f404aa406c2b38dc7fdb5.pdf?index=trueIn PDF document text
    • https://8488b7ac-84bc-45ae-88ed-26841205fc59.filesusr.com/ugd/7cda3c_e8bf2b6517d0427f80527f638a7ede73.pdf?index=trueIn PDF document text
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_0bf12f53c38c4109ae9d71cea122a1ac.pdf?index=trueIn PDF document text
    • http://fuvuvadut.onlinewebshop.net/lumomodojasuroke.pdfIn PDF document text
    • https://ef4b221f-cfb4-47e8-bf1d-3b5092770df7.filesusr.com/ugd/4948da_d2256f222e364f999e6fb454aa571510.pdf?index=trueIn PDF document text
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_651e0b517eb9441ca8ad5bfe16c79d58.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_off000121c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C8 5384 bytes
SHA-256: a777f89389bb89db9b256e5ae1260a01a614629e058b48f77889d8fea883e6b0
font_01_sfnt_off00013427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13427 12372 bytes
SHA-256: a9083bef40e203e20b8a629961e09841d8ff0df9faee9b2edccc59fcceed1720