Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ef6cebd58e380b…

MALICIOUS

PDF

71.3 KB Created: 2021-02-06 00:08:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 419f83fadbfefa0719b539fedcabd7f9 SHA-1: 2fe4c72e6ecec46bd96c7602ea2877c5becc860f SHA-256: 66ef6cebd58e380bf391e73db67c230f903d0c6113d683907456205d6db2b76a
204 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is identified as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a medium heuristic for a callback phishing lure. The document body, though partially corrupted, contains elements suggesting a lure related to an 'Ohio fishing report' and includes embedded URLs. The presence of multiple links on disposable hosting further supports a malicious intent, likely to direct users to phishing sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=ohio+fishing+report In PDF document text
    • https://static.s123-cdn-static.com/uploads/4413456/normal_5ffbf2c975ba8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464068/normal_601c859b84e28.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490266/normal_5ff84d97e72a6.pdfIn PDF document text
    • https://rolejiminuvaw.weebly.com/uploads/1/3/2/7/132740194/zekemusozogawu_gobul_bijubereje_fivixamiroz.pdfIn PDF document text
    • http://risiwivozival.iblogger.org/cdc_guideline_central_line.pdfIn PDF document text
    • http://lemixop.iblogger.org/barycentre_terminale_s.pdfIn PDF document text
    • https://deluneruniji.weebly.com/uploads/1/3/4/0/134012649/1417828.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jisokewiw.epizy.com/shielded_and_unshielded_twisted_pair_cable.pdfIn PDF document text
    • http://bomigezi.epizy.com/72450355775.pdfIn PDF document text
    • http://kitukogoxav.epizy.com/spanish_grammar_exercises_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/2002_song_lyrics.pdfIn PDF document text
    • http://tonabezagarizom.epizy.com/integrated_math_volume_2_answer_key.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_off0000dada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADA 4948 bytes
SHA-256: efab446072d86a6010b922b45a1e6d4275ff3adfc86773f0f677dabd650804d1
font_01_sfnt_off0000ebb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB3 10820 bytes
SHA-256: bad5518352415f5f90e668a2d5d0e02bc4ee03d3f21b11f7f21299e3f2225e89

Open this report in the interactive analyzer, or submit your own file for analysis.