Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cb85c8a1eb195bc…

MALICIOUS

PDF

77.0 KB Created: 2021-04-07 02:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: da4eaf8f9484138f5d4f4368d010d3f5 SHA-1: e0b0f2960e9231e7939d3a77661b483880669666 SHA-256: 3cb85c8a1eb195bcd4a61f378c2fa720d890bc0f718aa9d280b5b9f164e62dc5
184 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The embedded links, such as 'https://crophysi.ru/strik?utm_term=black+and+decker+rice+cooker+instructions+rc3314w', are designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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/strik?utm_term=black+and+decker+rice+cooker+instructions+rc3314w In PDF document text
    • http://copyrighthelp.info/pijopifibebez6y2l7.pdfIn PDF document text
    • https://nawiwunusuwo.weebly.com/uploads/1/3/2/7/132741181/8817299.pdfIn PDF document text
    • http://sentytld.online/arctic_wind_portable_air_conditioner_manual14xc3.pdfIn PDF document text
    • http://technodom11.com/subtracting_across_zeros_worksheet_freeypcgl.pdfIn PDF document text
    • https://fevebelok.weebly.com/uploads/1/3/4/0/134012800/wakofoko-lowagetogo.pdfIn PDF document text
    • http://good-production16.site/what_do_the_four_candles_of_advent_symbolize_lutheran6jlw8.pdfIn PDF document text
    • https://sawepaxir.weebly.com/uploads/1/3/1/8/131858353/xojubenedafadu_bujop_barefemagalap.pdfIn PDF document text
    • https://tosafesixagosug.weebly.com/uploads/1/3/1/3/131383933/mexisixine.pdfIn PDF document text
    • http://lerorelubujof.iblogger.org/31764789979.pdfIn PDF document text
    • https://fezagexagowib.weebly.com/uploads/1/3/5/3/135313062/8345093.pdfIn PDF document text
    • https://vejevidumuruje.weebly.com/uploads/1/3/5/3/135302175/toruxawezuxezapizuf.pdfIn PDF document text
    • https://xuwosanilenerev.weebly.com/uploads/1/3/4/9/134900173/nuweletabeguvoluke.pdfIn PDF document text
    • https://filigewu.weebly.com/uploads/1/3/0/7/130738657/bedot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a07bfc4f-105e-47be-8c6a-737c78a4853c/flight_sherman_alexie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fd4bd5c-d556-41ec-9f59-ebcfa9588331/xokasasopuje.pdfIn PDF document text
    • http://jepisaf.epizy.com/calculus_limits_review_questions_and_answers.pdfIn PDF document text
    • http://betudurinipop.epizy.com/strength_training_for_cyclists.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b21c5777-a5d9-4127-8d37-ef0912491e81/15422487047.pdfIn PDF document text
    • http://repiwefubuw.rf.gd/vapevaremidepebibajojuse.pdfIn PDF document text
    • http://zakuvusebaj.epizy.com/baker_act_form.pdfIn PDF document text
    • http://tapebujetunagu.rf.gd/fapugadipor.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_off0000eda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA7 5440 bytes
SHA-256: 75589a0479720bd8afde9b04d16901ad4bef5edd60764bf345c2472a88305cd8
font_01_sfnt_off00010055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10055 11192 bytes
SHA-256: defd56a8db9e738efb6360df26443f75d25443cd1da3e2042c57f8672a009d3c