Malicious PDF — malware analysis report

Static analysis result for SHA-256 15edbd3e09fc1b8f…

MALICIOUS

PDF

92.6 KB Created: 2021-01-13 07:17:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9f2ec5c5c515e7c97116671ddab8086e SHA-1: 49d5aaaf9c78685e19ac66ddfc2bbb264a98b791 SHA-256: 15edbd3e09fc1b8f7fce38c5286d1b7645c0be886de9bfb4de9e18611626f51f
146 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable hosting services, suggesting a link farm designed to redirect users to malicious sites. The document body, though partially garbled, indicates a lure related to a 'worksheet answer key', aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://trafficel.ru/123?utm_term=safety+in+the+laboratory+worksheet+answer+key PDF link annotation
    • https://cdn.sqhk.co/muwazubivotu/0abMRWM/geoffrey_moore_crossing_the_chasm_amazon.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvupalib/ghghQ6p/chiq_retro_fridge_white.pdfIn PDF document text
    • https://site-1176413.mozfiles.com/files/1176413/9_ft_pencil_christmas_tree_flocked.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500893/normal_5fbd3ed9f1087.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461746/normal_5fa52a9733cac.pdfIn PDF document text
    • https://site-1207400.mozfiles.com/files/1207400/rabexurud.pdfIn PDF document text
    • https://cdn.sqhk.co/kuxefoxo/xlgidic/qr_code_scanner_by_image.pdfIn PDF document text
    • https://site-1241652.mozfiles.com/files/1241652/2016_chevy_cruze_owners_manual.pdfIn PDF document text
    • https://site-1175494.mozfiles.com/files/1175494/biker_mice_from_mars_fanfiction_throttle_and_charley.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/jKhggfi/powirarawon.pdfIn PDF document text
    • https://site-1168131.mozfiles.com/files/1168131/the_max_omaha_events.pdfIn PDF document text
    • https://cdn.sqhk.co/tokarikadez/F4ljazz/woodworking_classes_san_diego_community_college.pdfIn PDF document text
    • https://site-1083884.mozfiles.com/files/1083884/turkish_to_english_conversation.pdfIn PDF document text
    • https://site-1168066.mozfiles.com/files/1168066/flaming_lips_artwork.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000124ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AC 2828 bytes
SHA-256: b7f317aa0f29cd34df008dc84d8f376d2685882a57a4a5cd0d86477d0adf885a
font_01_sfnt_off00012ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA7 5356 bytes
SHA-256: 594a24efb8f1085ddae4b5db354c85c11b931a87001186eeb4b973665f01b174
font_02_sfnt_off000140ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140EC 9896 bytes
SHA-256: 5f130b9a2972be9da703de011b1486783facb43c572163703125a4d61d4f6d57

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