Malicious PDF — malware analysis report

Static analysis result for SHA-256 44425f7fcc8bcd38…

MALICIOUS

PDF

77.7 KB Created: 2021-03-20 11:20:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 756fe68693f693fc9fa6009e0f29a2a3 SHA-1: b4f11d75dd606da38da190a4c344cf3c8580ea39 SHA-256: 44425f7fcc8bcd38d766b955a0367ceff17cd18dae8f61582c559217135797a9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to free templates, aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/123?utm_term=free+personal+cash+flow+statement+template PDF link annotation
    • https://cdn.sqhk.co/pudamunipum/hDcljak/boss_gt_10_patches_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463809/normal_603fcc11bbf5a.pdfIn PDF document text
    • https://xovixonu.weebly.com/uploads/1/3/4/8/134896571/e0d1cb75d.pdfIn PDF document text
    • https://cdn.sqhk.co/bujomukoda/aibDhiC/btd5_hacked_unblocked_online.pdfIn PDF document text
    • http://sentytld.online/70340563039rgnf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481675/normal_600efecb63f64.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/gcoijhi/snowfall_led_lights_walmart.pdfIn PDF document text
    • http://7lessons.space/whatsapp_plus_for_android_uptodownfvgro.pdfIn PDF document text
    • http://varietystore.website/govotasajujdskm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420586/normal_6036b53f28708.pdfIn PDF document text
    • http://ita-bio.space/convert_html_doc_to_freee6iq9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460682/normal_6036a7765f215.pdfIn PDF document text
    • https://foxuveguba.weebly.com/uploads/1/3/5/2/135297813/miregik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://425e2ee7-996f-4c6d-a593-b44a2a39b733.filesusr.com/ugd/bb05c1_36072fb85b7f4d59b12cbf0ee4d1545b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/37692645698.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/tovabosaxel.pdfIn PDF document text
    • https://ff5ab256-a407-4697-91b9-141751226614.filesusr.com/ugd/4205e4_c925e890a32649eb83c72a6635a91a4c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zalomi/agatha_christie_poirot_streaming_online_free.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_off0000f2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E1 5304 bytes
SHA-256: 5585504f19d2f8bb5dce4d95b304881803bb02021bf5e8e713ecc312841dfb1c
font_01_sfnt_off000104d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D5 10652 bytes
SHA-256: b45c42824a5d3f04103da4374cfa4b3f3837754e6a46887ebef6c9614c1cce33

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