Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c4617fbdcab8a1c…

MALICIOUS

PDF

80.4 KB Created: 2021-03-19 23:05:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 45e8a71f98a01b8a542511f5eca14a2c SHA-1: 26fc7213ff5e19f2268c1b99d235f50a7cc9daa9 SHA-256: 3c4617fbdcab8a1cb186fc62036edc5e60388f9f902f213aca923ef533749c7a
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, with a critical heuristic identifying it as a PDF link farm. ClamAV and an ML classifier also flagged it as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the nature of the link farm suggests a phishing or malicious redirection attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/123?utm_term=maraudon+classic+quests+guide
    • https://cdn.sqhk.co/resozasevej/ggKFjf5/98913153331.pdf
    • https://cdn-cms.f-static.net/uploads/4449187/normal_604146a69cb74.pdf
    • https://cdn.sqhk.co/tajiwikiter/gegihhp/xusugufurakixivojanelirel.pdf
    • https://cdn.sqhk.co/rujiwujik/hgEnoig/riki_taka_ti_tiki_taka_tik_tok.pdf
    • http://ferumejuworos.iblogger.org/vajudesokabul.pdf
    • http://kataval.22web.org/48653220346.pdf
    • https://cdn-cms.f-static.net/uploads/4408992/normal_5fd31e29963ca.pdf
    • https://cdn.sqhk.co/vakolitakap/EdvSFgj/modern_mania_wrestling_blood_feuds.pdf
    • https://cdn.sqhk.co/noneniwetav/ijxjeWb/xugatezujazemebezetiwubeg.pdf
    • https://cdn.sqhk.co/niserutom/hevGhfl/36335378537.pdf
    • https://cdn.sqhk.co/zaperarori/hagdgjd/kalulo.pdf
    • https://cdn-cms.f-static.net/uploads/4493916/normal_602e547db1ec1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://aca56392-15ae-48e8-982c-fdf6c4ac0dc3.filesusr.com/ugd/00c070_accb255c6b8a4f0292e3900dedd6efbd.pdf?index=true
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_b736a307b0014944a66a1c56309fb83d.pdf?index=true
    • https://69df74eb-9f83-488d-97bb-abb55063df61.filesusr.com/ugd/f34323_dcec830888a34536971d679866d6f58f.pdf?index=true
    • http://satonavuka.rf.gd/driver_impressora_hp_laserjet_pro_400_color_mfp_m475dw.pdf
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_41d5835ae5a241699f74c7efb038da23.pdf?index=true
    • https://f579be4a-c2ec-451d-94ee-532237c06880.filesusr.com/ugd/9f6a24_620927c5d6d446b8bb97af4abfe23cf2.pdf?index=true
    • http://redusaboj.epizy.com/introduction_to_geographic_information_systems_book.pdf
    • http://sexikajizetux.rf.gd/giwolanonezotarevurovu.pdf
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_de32506e2dba4017969f5e2e03113506.pdf?index=true
    • https://4a5660cc-52a2-48ff-9acb-4b4f1704cb6e.filesusr.com/ugd/81868d_087935534bf24ed99f6f3229ca4bcd7b.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdfb.bin
fd61c0d3cf0e95d6fab28b93a6cb0aa6fefa410d35f99437668465ea8584e40f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFB 5240 bytes
font_01_sfnt_off00010fda.bin
d4ea779eb2629d573a45fc24c2a14e5134eeb000263a63154bbaf535674cda5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDA 10556 bytes

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