Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0d80c9bea857e1…

MALICIOUS

PDF

68.1 KB Created: 2021-03-04 22:35:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 4cb581630b3aa6d51a30957fc3558090 SHA-1: 9aad8b09946f6fceff713105e43e41d10ab31edb SHA-256: aa0d80c9bea857e16c921ce8c5f91240ec3caa3ca6e98f5109d4cd982aa7b800
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to a 'Xerox workcentre 3325 parts manual', indicating a potential phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://golowaki.ru/strik?utm_term=xerox+workcentre+3325+parts+manual PDF link annotation
    • http://fisuruwibowin.66ghz.com/seated_calf_raises_proper_form.pdfIn PDF document text
    • https://dapazigozasonim.weebly.com/uploads/1/3/4/4/134466252/rexujonuxosujiwixaje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406208/normal_5fdb0f7563861.pdfIn PDF document text
    • http://dewisazovuvoxi.mywebcommunity.org/what_is_a_normative_ethical_question.pdfIn PDF document text
    • http://vumavotanumibuv.iblogger.org/como_hacer_la_metodologia_de_un_proyecto_de_investigacion_ejemplos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461219/normal_5fe3373e74184.pdfIn PDF document text
    • https://cdn.sqhk.co/xasurila/qieTVid/houston_bcycle_promo.pdfIn PDF document text
    • https://nutifikidejuz.weebly.com/uploads/1/3/4/3/134347692/2897536.pdfIn PDF document text
    • http://pegijegur.mygamesonline.org/legegekozefagoloz.pdfIn PDF document text
    • http://xevusezes.medianewsonline.com/wurogavagis.pdfIn PDF document text
    • https://cdn.sqhk.co/lilomovetum/ieCgcjb/rabbit_s_magic_adventures.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379233/normal_5ff6767c5bc81.pdfIn PDF document text
    • https://cdn.sqhk.co/gomalajipo/bGv7ibg/toe_nail_designs.pdfIn PDF document text
    • https://suterigegopos.weebly.com/uploads/1/3/2/6/132695321/6861539.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://noratev.myartsonline.com/academic_stress_scale_for_high_school_students.pdfIn PDF document text
    • http://redifigikutusoj.myartsonline.com/95022187189.pdfIn PDF document text
    • http://jozilaro.atwebpages.com/vijux.pdfIn PDF document text
    • http://lowevetefevug.rf.gd/what_is_the_difference_between_flight_of_ideas_and_loose_associations.pdfIn PDF document text
    • http://melaworogafema.epizy.com/bizarege.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_off0000ce64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE64 5700 bytes
SHA-256: 24895d59596ba36a857ffea994fd1c4a01d714eda709e6285caa1a565f08bf52
font_01_sfnt_off0000e1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D2 9812 bytes
SHA-256: cae64cd71f8309024e563e8443ba0b91b2b2b2a8ed749ab7ac5001abd3a9e37d

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