Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ec936291121c484…

MALICIOUS

PDF

77.4 KB Created: 2021-01-17 03:41:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 15ef78f81185b98a7eae7882d71aede9 SHA-1: fd42836e2d7d4babff390d26d2bb80574481c8ad SHA-256: 4ec936291121c4842a59e8b0a10bd6c20517e3e1aaf37ec9e319b46d0e22d356
126 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm and a phishing attempt, with a high ML score and ClamAV detection confirming maliciousness. The embedded URL points to a domain associated with malicious activity, and the document body, though heavily obfuscated, suggests a lure related to 'redox reactions worksheet answers'. No scripts were extracted, but the PDF structure itself is indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafffe.ru/123?utm_term=redox+reactions+worksheet+answers+chemistry+if8766 PDF link annotation
    • https://site-1166605.mozfiles.com/files/1166605/21500643381.pdfIn PDF document text
    • https://site-1178197.mozfiles.com/files/1178197/shielded_metal_arc_welding_crossword_answers.pdfIn PDF document text
    • https://site-1172822.mozfiles.com/files/1172822/wizebusumajefajiru.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxabofapuw/cNaAjjF/best_performance_tuner_for_6._0_powerstroke.pdfIn PDF document text
    • https://jegotojojenume.weebly.com/uploads/1/3/4/6/134600583/9cc841d39665.pdfIn PDF document text
    • https://ponorevex.weebly.com/uploads/1/3/1/3/131398269/toviremajak-detifanisudak.pdfIn PDF document text
    • https://site-1247010.mozfiles.com/files/1247010/can_t_new_apple_watch_faces.pdfIn PDF document text
    • https://site-1166703.mozfiles.com/files/1166703/schiffman_and_kanuk_2020_consumer_behaviour.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pukiza/formalits_cession_de_parts_sarl.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/bitdefender_internet_security_2019_testversion.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000dcd7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xDCD7 13336 bytes
SHA-256: c9ed80a8338feec37f1a51ba78d9113ff95a7797ee54db7ca2e9fb8a1f4dbdae
font_00_sfnt_off0000c87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87A 5988 bytes
SHA-256: 7ce7c9899eb300da5471a1bc6ba8873b35fee7023a24621f653291dc648650e8
font_02_sfnt_off0001025b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025B 10952 bytes
SHA-256: ae43dda809cf93228cc13a1b08d6135d9497a351bd009a3eaecb2908d8eb1471

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