Malicious PDF — malware analysis report

Static analysis result for SHA-256 407bedf8232924c5…

MALICIOUS

PDF

76.6 KB Created: 2021-03-10 14:38:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 0658af88bc72e1bdacc1fc450b42f569 SHA-1: 8f11d5b27088700ff549d700c9d694063d7eac7d SHA-256: 407bedf8232924c5df6a8efc13da9f2f0adb995bb796abdb9405386417c40bb1
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits vulnerabilities or contains malicious links. The heuristics reveal it functions as a link farm, containing numerous external URIs pointing to various domains, some of which are hosted on disposable infrastructure. The primary purpose appears to be directing users to potentially harmful content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://mezovuduw.ru/wix?keyword=grim+dawn+shattered+realm+farming PDF link annotation
    • https://cdn.sqhk.co/foxoxaze/ieMihii/new_england_hiker_murdered.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzefoke/dNVhge5/bovegoxujudere.pdfIn PDF document text
    • https://boraweterepin.weebly.com/uploads/1/3/4/8/134864111/407f8259857d7.pdfIn PDF document text
    • http://d2-club.ru/what_is_the_meaning_of_phrase_miss_the_boat60dv9.pdfIn PDF document text
    • https://kepiloxuxamife.weebly.com/uploads/1/3/0/7/130740378/silonamine.pdfIn PDF document text
    • https://cdn.sqhk.co/gebitasixa/hCSjdpy/imperator_titan_model_size.pdfIn PDF document text
    • http://romeita.fun/98446379117ck5s1.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutorixo/VRudaeD/42275842049.pdfIn PDF document text
    • https://sijetuso.weebly.com/uploads/1/3/4/4/134499475/5c4c7.pdfIn PDF document text
    • https://cdn.sqhk.co/fematixub/fgiVHX3/spotify_for_artists_canvas_not_available.pdfIn PDF document text
    • http://shopbest.online/the_midwifes_apprentice_summaryyibx9.pdfIn PDF document text
    • https://cdn.sqhk.co/ganidabizi/Wjgjehh/ultimate_jungle_simulator_mod_apk_android_1.pdfIn PDF document text
    • https://cdn.sqhk.co/mitejapeki/cjdhbhi/gakutafonoge.pdfIn PDF document text
    • https://cdn.sqhk.co/bitomasijelo/40Mgg0u/stadium_ludogorets_arena.pdfIn PDF document text
    • http://businesslinecenter.com/86035401292mnsv6.pdfIn PDF document text
    • https://cdn.sqhk.co/rizijuwet/2icibtd/vobijoboso.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/a35b9e68-bdef-459f-b0f8-78467157389d/99662071517.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4adec78-ac22-4e86-b6e4-892b34ec88c9/how_many_red_face_cards_are_there_in_a_deck_of_52_cards.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/33779858217.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/87876404019.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/jifelelivaliweximidesim.pdfIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/33057323202.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de20b659-27a0-4c1c-bb10-fb7c2582662f/que_es_composicion_en_dibujo_artistico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c71bf7ee-e0b7-4fc1-aade-7280f584155f/ronaduti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc5555c7-509d-42c7-ac22-d4517d566d8b/27008470523.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_off0000ee81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE81 5444 bytes
SHA-256: f0148ee93146466b768fdcf512c81a81760a26cdebb71ba112798a5fa44b1b36
font_01_sfnt_off000100ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100ED 10396 bytes
SHA-256: 71670be731da245100c72f782abe22e27b22fc888f273959ffa1094b413408d3