Malicious PDF — malware analysis report

Static analysis result for SHA-256 05a2084f7389ec3f…

MALICIOUS

PDF

74.7 KB Created: 2021-06-09 23:40:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7a6189fa67f55d0aa0f6640b1f4e7f5 SHA-1: e3ecb97a2b1ba4ce9faaa623ba77bd141d0c5a5f SHA-256: 05a2084f7389ec3f2cd83b84ced562bdbcb2ae3e6189bc6c7dc0d529a851080d
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL pointing to a suspicious domain. Heuristics indicate the presence of external URIs and a general ML classification of maliciousness, further supported by ClamAV detection as a phishing trojan. The document body, though partially garbled, suggests a lure related to 'modal verbs obligation and prohibition'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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://irlanc.ru/pbw?utm_term=modal+verbs+obligation+and+prohibition
    • https://static.s123-cdn-static-d.com/uploads/4455672/normal_60b4e834f1001.pdf
    • https://cdn-cms.f-static.net/uploads/4369626/normal_6057e3e8d5e85.pdf
    • https://static.s123-cdn-static.com/uploads/4470835/normal_6008439620d6a.pdf
    • https://static.s123-cdn-static.com/uploads/4452389/normal_5fc7fd94ba83c.pdf
    • https://static.s123-cdn-static.com/uploads/4454161/normal_5fe509e241cb7.pdf
    • https://cdn-cms.f-static.net/uploads/4417536/normal_60bed01f1dcc9.pdf
    • https://cdn-cms.f-static.net/uploads/4491673/normal_604d633427339.pdf
    • https://cdn-cms.f-static.net/uploads/4421474/normal_60406b6e6caf5.pdf
    • https://cdn-cms.f-static.net/uploads/4459787/normal_603525811fcc8.pdf
    • https://cdn-cms.f-static.net/uploads/4480598/normal_606737f4d80c7.pdf
    • https://cdn-cms.f-static.net/uploads/4476936/normal_605d968da91aa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xuresasadox.pbworks.com/w/file/fetch/144459450/how_to_write_a_complaint_letter_for_hostile_work_environment.pdf
    • http://jutifakukap.pbworks.com/f/20474673404.pdf
    • http://zanikofepaj.pbworks.com/f/the_twisted_ones_graphic_novel_download.pdf
    • https://uploads.strikinglycdn.com/files/16fc4d1f-0ef3-4dfb-af98-afb094d648c9/nekawufubopatakobulizetiw.pdf
    • http://zajozote.pbworks.com/f/77922744150.pdf
    • http://genarozep.pbworks.com/f/how_does_globalization_affect_africa.pdf
    • https://uploads.strikinglycdn.com/files/61b49a11-f8db-418a-a026-3a3772b2fd75/denotation_and_connotation_worksheet_with_answer_key.pdf
    • 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_off0000e5e9.bin
35ef209af9ad0f0ced957326101953084d7e0b1d7cc09cbcc13183d3e87c3603
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E9 5428 bytes
font_01_sfnt_off0000f862.bin
7d6825ce88f2c9a88db91ee8e0f2c3f02f993fdce940cbe5bcce7a7e86eb718b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF862 11164 bytes