Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc1b8f94a7fc33df…

MALICIOUS

PDF

87.7 KB Created: 2021-03-16 08:44:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: eab053b20a042e456e58741ca00d4373 SHA-1: 28013eacfcd75023992d30d8782cc7e1fd0e34b1 SHA-256: fc1b8f94a7fc33df2b6b5656c68ea35a2785f8329eebb458ee7fdc8bc14c614b
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://soxebez.ru/strik?utm_term=a+guide+to+rational+living+reddit PDF link annotation
    • http://uchebnoe.website/zugatokafebnztv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423728/normal_60271b07c675f.pdfIn PDF document text
    • http://health2health.online/jumpstart_to_skinny_reviewsajceb.pdfIn PDF document text
    • http://ital-girl.space/bakov580xt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427811/normal_5ff7cca382c2a.pdfIn PDF document text
    • https://cdn.sqhk.co/patizuruf/g6id7gw/ravonadilafusevepen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402507/normal_5fdb345648a55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375093/normal_5fd83dfc82ee9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416928/normal_604ee531e6e4a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445558/normal_5feb6c5e63baf.pdfIn PDF document text
    • http://kittyplay.online/how_to_cancel_rental_agreement440wb.pdfIn PDF document text
    • https://cdn.sqhk.co/wizevomorofe/Xgcgjgg/79833175318.pdfIn PDF document text
    • https://cdn.sqhk.co/jomububorava/fXe74hb/vanilla_cake_recipe_easy_no_buttermilk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467318/normal_5fca8a8d29763.pdfIn PDF document text
    • http://xavubizuj.22web.org/horoscope_broadcast_pack_after_effects_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xesidif.epizy.com/juvukuvubefokadirejo.pdfIn PDF document text
    • http://juvoken.epizy.com/engineering_mechanics_dynamics_8th_edition_meriam_solutions.pdfIn PDF document text
    • http://rovarede.rf.gd/baghdad_pact.pdfIn PDF document text
    • http://lojupefiduk.epizy.com/33803599158.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_off0001188f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188F 4864 bytes
SHA-256: cdb5e45d422b4e829903e0d1e5879084d2a156d4565dabfa9dec28ca64a4580a
font_01_sfnt_off00012931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12931 11444 bytes
SHA-256: de6864bc21e4bb9c6dfde2ba2396914b1ce8aa121098374888eeb359aa8918c0

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