Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3b57d2e76020bdd…

MALICIOUS

PDF

69.2 KB Created: 2021-02-10 18:04:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 5bbe70dfa14b5b4a6ca167ccc96f1ad1 SHA-1: b087f1ecbb44b169eeb96c5b5028134e8cd44880 SHA-256: d3b57d2e76020bddbd7b136f9b01f31984da2a546012a2775457b13080631634
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document was flagged by multiple heuristics as a link farm, containing a large number of external links pointing to potentially malicious domains. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The document's structure and the presence of numerous external links suggest an attempt to lure users to external sites, likely for phishing or to download further malicious content.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/123?utm_term=holistic+definition+in+spanish PDF link annotation
    • https://cdn.sqhk.co/kegufamop/a32RjaM/pac_xon_deluxe_juegos_friv.pdfIn PDF document text
    • https://cdn.sqhk.co/xevowuto/ehDHjdG/jidorexer.pdfIn PDF document text
    • https://cdn.sqhk.co/vufebevefo/bHOodEI/pitch_tuner_app_download.pdfIn PDF document text
    • https://nivujetomut.weebly.com/uploads/1/3/4/7/134753784/vogaxezukumusopi.pdfIn PDF document text
    • http://123dutch.com/carding_amazonpsfcs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388619/normal_5fc5ab5075701.pdfIn PDF document text
    • http://ourfanz.com/delicious_dinner_recipes_vegetarianpncy0.pdfIn PDF document text
    • http://ampinternational.org/pevukokexuzadoda7qtfh.pdfIn PDF document text
    • https://cdn.sqhk.co/pesuxigu/7KEgjhj/iron_heart_canning_company_nh.pdfIn PDF document text
    • https://cdn.sqhk.co/wifukatar/bF4gdhh/mudarazusaverebonaliz.pdfIn PDF document text
    • https://cdn.sqhk.co/tatudawo/mgjWzK7/glitch_live_wallpaper_ios.pdfIn PDF document text
    • http://maska-respirator.com/timofosepamejedodifokihgjm2.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/hUcgjjb/33586863541.pdfIn PDF document text
    • https://cdn.sqhk.co/votojuxosaf/dsrhJha/alone_season_7_cast_list.pdfIn PDF document text
    • https://cdn.sqhk.co/lukejisuvawe/ggggPhb/plantas_contra_zombies_garden_warfare_2_pc.pdfIn PDF document text
    • https://binufigelivu.weebly.com/uploads/1/3/4/7/134775083/mexinalesax.pdfIn PDF document text
    • http://pedron.fun/560217433392si2o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381102/normal_6008092f2d71f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD062 5108 bytes
SHA-256: d5bba6750494d49f7b247e2a3877accca2b75a8676e38863e970ed5df1d47377
font_01_sfnt_off0000e1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C5 11360 bytes
SHA-256: 9791733d6b9ec1599b347dcc9ef91d6c968db095b2f5c0bb3d5c5c21b4bdc3bd

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