Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dd129d4d41a1eb9…

MALICIOUS

PDF

88.1 KB Created: 2021-03-11 15:23:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a90dc660f2911c3089c587234a2c680b SHA-1: d94f35d3f3e58d3f38ab2567851de86cd8a17f2d SHA-256: 1dd129d4d41a1eb971a000e5f21681432081f8ae4fc88c97e69285fc38341ad3
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many hosted on disposable domains, which is characteristic of a link farm used for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to direct users to malicious websites or download further payloads. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 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://vilenefex.ru/award?keyword=a+clockwork+orange+text+pdf PDF link annotation
    • https://cdn.sqhk.co/vovidonob/dzojgtI/general_knowledge_quiz_answers_easy.pdfIn PDF document text
    • https://cdn.sqhk.co/libegavezu/Janhhhi/flight_attendant_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469623/normal_6046656f2947b.pdfIn PDF document text
    • https://cdn.sqhk.co/dilobowuz/Njcie6T/bee_gees_best_songs_ranked.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461777/normal_5fdfc86a69228.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368478/normal_6014e02db4516.pdfIn PDF document text
    • https://cdn.sqhk.co/gufezitaxato/QNhhji8/34027344272.pdfIn PDF document text
    • https://cdn.sqhk.co/zisubiziwu/diarK5H/68809286830.pdfIn PDF document text
    • http://sumazubaviloxog.22web.org/palefanexunek.pdfIn PDF document text
    • https://cdn.sqhk.co/wanaxowuwot/lheifhl/38087839808.pdfIn PDF document text
    • https://cdn.sqhk.co/nifijagik/3ihhjjj/casio_edifice_eqb-_500l-_1aer_manual.pdfIn PDF document text
    • http://kojaruw.iblogger.org/53980341484.pdfIn PDF document text
    • https://cdn.sqhk.co/zezaxemepe/yhiZgdO/tozizew.pdfIn PDF document text
    • https://cdn.sqhk.co/babakobesuxe/Bvaoibe/femiwimefeluwavufufapukip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369182/normal_60209bc288149.pdfIn PDF document text
    • https://cdn.sqhk.co/pojimisuso/djigjhd/metal_7_dsemus.pdfIn PDF document text
    • https://cdn.sqhk.co/levowexesu/hgTdhjM/splashtop_wired_xdisplay_only_mirror.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481676/normal_5fed5e70d2f79.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_eb90472019144cc0a1749c5f0c1cc1d5.pdf?index=trueIn PDF document text
    • http://dunupilopun.epizy.com/business_environment_book_for_mba.pdfIn PDF document text
    • https://09ec9d85-9312-4337-94d0-b84080e05f2e.filesusr.com/ugd/ac0094_70f21ff4c3e64b2a8be30796796690b0.pdf?index=trueIn PDF document text
    • https://dd67658a-cc17-4e1c-bca5-42bf299a485b.filesusr.com/ugd/07a440_37f59320f57544679c095fddb2a5abad.pdf?index=trueIn PDF document text
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_2ff8b56c97d04e11ad2f6cdbfcd387c5.pdf?index=trueIn PDF document text
    • https://d45380bd-a93d-4ef2-b2bd-4c7806d1f6db.filesusr.com/ugd/5d2cf3_231f151ada71473cb2bb0827d3bdff75.pdf?index=trueIn PDF document text
    • http://womutefipile.epizy.com/canon_mp160_ink_cartridge_reset.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11027 5100 bytes
SHA-256: 1e8aa5ccbade6257d943c71d20cd1dae6039bb74b8a612fa5488304e06bbf33f
font_01_sfnt_off0001219f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219F 10104 bytes
SHA-256: bf57fb14bdd773e9c4c9b718981d0e416793b4a27c909f900c449566c44cbbe2
font_02_sfnt_off00014447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14447 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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