Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bd50e17af585374…

MALICIOUS

PDF

74.0 KB Created: 2021-02-24 09:58:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 41b20d06f48675556e18152532a3e190 SHA-1: de2005064a8d31051c40c0959de026bba13c2ece SHA-256: 3bd50e17af585374cc1197b98f6f261d4b60abf54f75948bc9c2d3e6a00c8e98
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to disposable domains and Weebly-hosted files, indicating a link farm designed to redirect users to potentially harmful content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document's primary purpose is to host a large number of external links. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution attempt.

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://druttle.ru/aws?utm_term=does+phalogenics+actually+work PDF link annotation
    • https://bajixaxazuxu.weebly.com/uploads/1/3/1/3/131383864/bc16e9.pdfIn PDF document text
    • https://fakavenudir.weebly.com/uploads/1/3/4/0/134042443/455537.pdfIn PDF document text
    • http://wwnews.site/anniversary_wishes_song_for_husbandog05r.pdfIn PDF document text
    • https://cdn.sqhk.co/talexadu/asHcCma/cut_the_rope_time_travel_10-_4.pdfIn PDF document text
    • https://gifivetusox.weebly.com/uploads/1/3/4/7/134736849/lanexuten-vexaminag-poxufusasewebek.pdfIn PDF document text
    • https://xefapakofaguwa.weebly.com/uploads/1/3/1/1/131164324/gelexalox.pdfIn PDF document text
    • http://repair-foto.ru/lukileluzowo9k6vy.pdfIn PDF document text
    • http://prazdnikprosto.ru/kazuvilulijopafowopotiwih7vqg.pdfIn PDF document text
    • https://cdn.sqhk.co/lewiwifo/idzhdlE/pepodifejarazujo.pdfIn PDF document text
    • http://whysmall.space/the_count_of_monte_cristo_movie_online_subtitrat0afeh.pdfIn PDF document text
    • http://skameyki.club/jimopajujepodepu1y8zk.pdfIn PDF document text
    • https://cdn.sqhk.co/pixisuja/gibJhhZ/battery_charger_walmart.pdfIn PDF document text
    • https://cdn.sqhk.co/zukasedu/hjRHjeK/55988349052.pdfIn PDF document text
    • http://lnstagram-helping-centre.com/char_griller_akorn_6520_manualg2zo8.pdfIn PDF document text
    • https://cdn.sqhk.co/ledirevobep/hwidgg2/17700053893.pdfIn PDF document text
    • https://xudidetopos.weebly.com/uploads/1/3/4/5/134579215/06376d8.pdfIn PDF document text
    • http://regsenatvumen.website/42922118045ixlbm.pdfIn PDF document text
    • https://fesoviso.weebly.com/uploads/1/3/4/7/134710514/b581957c4311.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409826/normal_6026f781ae66e.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BA 5452 bytes
SHA-256: 572fbce6a13bb14fe9af2a025712fd8b34ee2770835208f6d0c61aa486855cbf
font_01_sfnt_off0000f561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF561 11076 bytes
SHA-256: a4146a733d22931e9872d27841c865ebd6e071301d1028aa804bea542c9aa8c5

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