Malicious PDF — malware analysis report

Static analysis result for SHA-256 e25f22f0c053ad47…

MALICIOUS

PDF

73.4 KB Created: 2021-02-21 21:14:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 28246e7b1607229b355cfd98b1ab3750 SHA-1: 5a9af3d05225be119daf999f4e488c7000c38867 SHA-256: e25f22f0c053ad475ee8967eb840810dd3c9bdbca5f832f729ab2fbc16433336
204 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier. It contains numerous embedded URLs, with at least one pointing to a known malicious redirector. The document body is heavily obfuscated, but the presence of embedded URLs and the 'callback phishing phone lure' heuristic suggest an attempt to trick the user into interacting with malicious content or services. The PDF also utilizes link farming techniques on disposable hosting, further indicating malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://yafferge.ru/wix?keyword=ha+gaaay+actor In PDF document text
    • https://cdn-cms.f-static.net/uploads/4483864/normal_602fa79556e69.pdfIn PDF document text
    • https://rimozaruminipa.weebly.com/uploads/1/3/5/3/135391391/3176054.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389074/normal_602750e64d923.pdfIn PDF document text
    • https://baxopaparoxiw.weebly.com/uploads/1/3/1/4/131454316/d7256dd5b76df1f.pdfIn PDF document text
    • https://lasomuvexovip.weebly.com/uploads/1/3/0/8/130813571/2541294.pdfIn PDF document text
    • https://jetezilim.weebly.com/uploads/1/3/0/7/130775858/6199859.pdfIn PDF document text
    • https://golizagizaziw.weebly.com/uploads/1/3/4/7/134701046/5815806.pdfIn PDF document text
    • http://nisiwitas.22web.org/niv_chronological_study_bible_large_print.pdfIn PDF document text
    • https://lifulufo.weebly.com/uploads/1/3/1/3/131379971/kozumexise-nikelufededov-jefarikematos.pdfIn PDF document text
    • http://nuwiratuzitezep.22web.org/bulksms_for_android_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/56743778549.pdfIn PDF document text
    • https://s3.amazonaws.com/xubifupi/mcgraw_hill_answer_key_science_8th_grade.pdfIn PDF document text
    • http://zumepif.rf.gd/rs3_120_fishing_guide.pdfIn PDF document text
    • http://ketaxesam.epizy.com/gitinaso.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_off0000e2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E1 4820 bytes
SHA-256: 21ca56ca327a43fbb3f8b0ace54763af81dd5b1deba5aa34d904f5cb7e90f124
font_01_sfnt_off0000f362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF362 11620 bytes
SHA-256: 97ec1bfe844942c30c850d20ca873f2f36a9ed4eea94712ddec48b8c5abf8ddf

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