Malicious PDF — malware analysis report

Static analysis result for SHA-256 d49a8ad81c33e6fe…

MALICIOUS

PDF

73.7 KB Created: 2021-02-22 19:54:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 453f66f10cbd0e3664d650c94344803b SHA-1: e1c4032f67bc705caa2538a120738c742ff991ba SHA-256: d49a8ad81c33e6fec73d480ef41b85e685074a794525a9b6c330255bd25691d2
204 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one identified as a malicious redirector. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on disposable hosting, suggesting a phishing or malicious redirection attempt. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/wb?keyword=do%20mott In PDF document text
    • http://meblik.su/browning_auto_5_friction_ring_setupet32b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474446/normal_6025867490782.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378618/normal_5fcdac5bc441e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392659/normal_602443604f07a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ruxuwidoke.epizy.com/worksheet_food_english.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/baseline_survey_methodology.pdfIn PDF document text
    • http://fowixopepe.epizy.com/57945191972.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/tweak_cydia_app_store.pdfIn PDF document text
    • http://jujewubimowe.rf.gd/54050322861.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/miferelol.pdfIn PDF document text
    • http://zuniguvip.epizy.com/65160189795.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_off0000e2db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DB 5452 bytes
SHA-256: 496bfda9eff7a70b37874a0804addb07c2118f879a795af77a4ff65f38040c64
font_01_sfnt_off0000f557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF557 10800 bytes
SHA-256: 6c3379c171dd6cfdc4bed49ad2dc595dbcceb9c1af2cff1acb69ef46a4d65c25