Malicious PDF — malware analysis report

Static analysis result for SHA-256 aec92a0dac0c890e…

MALICIOUS

PDF

73.9 KB Created: 2021-04-20 17:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9df0caf4744200d9a4a5f997302442d3 SHA-1: ef593794ebac2d4a6080b88e6a073380856b1717 SHA-256: aec92a0dac0c890ef0eaff6f52de145238a498b806610fbfe063848588f4c26c
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains a string related to 'how to get osha certified for forklift', likely used as a lure to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/strik?utm_term=how+to+get+osha+certified+for+forklift PDF link annotation
    • http://tuwosip.iblogger.org/30855208539.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392868/normal_5fe7043021dbe.pdfIn PDF document text
    • https://lovivusopeme.weebly.com/uploads/1/3/6/0/136095788/4839867.pdfIn PDF document text
    • http://zegevuk.22web.org/chela_sandoval_methodology_of_the_oppressed.pdfIn PDF document text
    • http://fomolazekuwok.22web.org/jezolafupisak.pdfIn PDF document text
    • https://wojaginobaxap.weebly.com/uploads/1/3/1/8/131857211/4886430.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426080/normal_603a028517bb6.pdfIn PDF document text
    • http://jabolemifagafu.22web.org/lujufumojezexipedevafom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387242/normal_5fcad3c286094.pdfIn PDF document text
    • https://vorusasu.weebly.com/uploads/1/3/2/7/132740845/042e791268bd98f.pdfIn PDF document text
    • https://xaburopufazig.weebly.com/uploads/1/3/6/0/136051881/medaso.pdfIn PDF document text
    • https://venakadu.weebly.com/uploads/1/3/4/7/134729608/475964.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://giwofigu.epizy.com/printable_monthly_calendar_july_2020.pdfIn PDF document text
    • http://xubudexev.epizy.com/income_tax_rate_in_pakistan_2020_17.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9590a87-fa82-46f6-a9a9-30ab87224d8c/64763652332.pdfIn PDF document text
    • http://gudukamu.rf.gd/23152135105.pdfIn PDF document text
    • http://dajidagetulawu.epizy.com/shani_graha_mantra_in_telugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c94476bd-5b67-4955-b0e1-5cf44b211e35/sandman_audible_part_2_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37449054-e384-4e68-9e22-cf1c53564734/microsoft_office_2016_free_download_for_windows_10_64_bit_offline.pdfIn PDF document text
    • http://zuretadi.rf.gd/zolixexevamuma.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_off0000e199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE199 5400 bytes
SHA-256: d29b857523faa2ea56af965691dc4afcec8277be8f1ef4aa02d102c628b3a9cb
font_01_sfnt_off0000f405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF405 10836 bytes
SHA-256: f4bcc8ea84c094138a9aa37df262ae3d09798d994ec9db75f3573e1db8c56d6c

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