Malicious PDF — malware analysis report

Static analysis result for SHA-256 775d8e66af66ca9e…

MALICIOUS

PDF

82.9 KB Created: 2021-04-04 12:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8de5879bf6d768309148c38018085ed5 SHA-1: 694540b4874fce3e5303dc9b417b184f5411d29f SHA-256: 775d8e66af66ca9e6402cf0e3e3229e66fe84a28ff76e6929cb7f58163dd4d8d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of embedded external links, a technique often used for SEO spam or phishing. The primary malicious URL identified is https://dafemum.ru/strik. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/strik?utm_term=bissell+proheat+2x+revolution+1551+parts
    • http://itwomen.space/tilolewiladqrnpr.pdf
    • http://kavelizopepi.mywebcommunity.org/54340585330.pdf
    • http://zusozujowumid.iblogger.org/narexusavaguvabimatamibal.pdf
    • http://wowezixuxaxu.22web.org/blitz_the_league_ps2.pdf
    • http://unityfree.xyz/noxovoi0nr2.pdf
    • http://segupatotujipiv.iblogger.org/vasojoloded.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nosigegu.onlinewebshop.net/unscramble_sentences_exercises.pdf
    • https://s3.amazonaws.com/tuzakifezara/xikudusorunafuwowirafena.pdf
    • http://fadafupeludelin.rf.gd/22128481386.pdf
    • https://9042e326-c85f-44e6-b9b6-0c206471fdba.filesusr.com/ugd/0d2fda_b8c5dc74d23c415ebd24169df3e43c8b.pdf?index=true
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_24c809c7c2e244be9c3186cd667f7b1e.pdf?index=true
    • https://s3.amazonaws.com/fadedosi/canada_visa_information_peru.pdf
    • https://83f018a0-8e49-44f0-b57e-805e464a5f06.filesusr.com/ugd/10a4aa_14a129221ec84f8f9473b89734788a23.pdf?index=true
    • https://s3.amazonaws.com/divikufifir/ferilunobubibibivarumova.pdf
    • https://s3.amazonaws.com/veledabejufi/34911740574.pdf
    • https://s3.amazonaws.com/latufenaw/48926722405.pdf
    • https://s3.amazonaws.com/pukiza/93599661313.pdf
    • http://pisatetakedabak.epizy.com/kaxufuzaxojajaminas.pdf
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_0217080d383549af8783548e7de4aca7.pdf?index=true
    • https://s3.amazonaws.com/legipalofi/94750153704.pdf
    • http://kitilogokufalu.atwebpages.com/emotional_guidance_scale_esther_hicks.pdf
    • https://s3.amazonaws.com/banula/45500632105.pdf
    • https://s3.amazonaws.com/satedafadusizo/45476073412.pdf
    • https://s3.amazonaws.com/wolina/31895200311.pdf
    • https://21c505bb-01ca-4817-a549-4ed1ebba5040.filesusr.com/ugd/7d7105_07783baf27f04b35b0f53e04ddcf987e.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102cd.bin
d8353f77aa3df02d45bd0795ede57a10b5016dbd04ed49b50e890c462fa71d77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102CD 5392 bytes
font_01_sfnt_off00011530.bin
176705d30f6abf1ada008538e8abeec0b7b5b0269872e332f0d5d2727809bd6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11530 12116 bytes

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