Malicious PDF — malware analysis report

Static analysis result for SHA-256 138c3f6b3dd0ff51…

MALICIOUS

PDF

79.3 KB Created: 2021-03-28 04:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: cb0d42a9a4f331702198105acd900fc0 SHA-1: 930851fc707fc11047a5696a9b4fb65ad2afa682 SHA-256: 138c3f6b3dd0ff51f99141bb9d39916e29ef0e5759f89aed9b4e92e2ee720a5e
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, identified as a link farm, likely intended to manipulate search engine results or redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing or trojan activity. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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=archie+vs+predator+pdf PDF link annotation
    • http://zarabatyivat.ru/samsung_xpress_m2835dw_drum_unit0op1o.pdfIn PDF document text
    • http://realnoe-obshenie.online/bhartiya_kala_ka_itihas_bookgcd5l.pdfIn PDF document text
    • https://lasarowolu.weebly.com/uploads/1/3/6/0/136024073/xuzovatiter.pdfIn PDF document text
    • https://rokumetusemep.weebly.com/uploads/1/3/4/3/134382705/rezexezumavigew.pdfIn PDF document text
    • https://zovakilezogavi.weebly.com/uploads/1/3/1/1/131163957/wotuto_pojifivun.pdfIn PDF document text
    • https://dufevirefat.weebly.com/uploads/1/3/1/4/131438490/kagemonavonibuxiloj.pdfIn PDF document text
    • https://tubozabuzimez.weebly.com/uploads/1/3/4/8/134878922/9f38b58ed6e24bd.pdfIn PDF document text
    • https://fifukujujaki.weebly.com/uploads/1/3/2/6/132680890/rekarujumu.pdfIn PDF document text
    • https://safafiva.weebly.com/uploads/1/3/0/7/130739101/xunugenirisuno.pdfIn PDF document text
    • https://vosanabawikek.weebly.com/uploads/1/3/4/0/134000461/rizuzepuluro.pdfIn PDF document text
    • http://zhenskiizhurnal.ru/singer_simple_3223g1u6z1.pdfIn PDF document text
    • https://rodamopuxex.weebly.com/uploads/1/3/4/3/134354351/37c099af2b27.pdfIn PDF document text
    • http://profibrend.ru/the_best_school_year_ever_quizletocyte.pdfIn PDF document text
    • http://instapriz.online/what_child_is_this_christmas_song_instrumental7m7zq.pdfIn PDF document text
    • https://zonapabudaxaj.weebly.com/uploads/1/3/4/0/134017389/3192719.pdfIn PDF document text
    • https://surugatolezijef.weebly.com/uploads/1/3/4/6/134631687/4937572.pdfIn PDF document text
    • https://tagalevef.weebly.com/uploads/1/3/0/8/130815582/daxulobabaz_guxobolepa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/juvetaso/dragon_age_origins_gift_guide_dlc.pdfIn PDF document text
    • https://ad323f3e-245e-4e3c-8b16-de91fefec063.filesusr.com/ugd/5ea691_5c7d87a03bae45b68850df0dc2e3ecdd.pdf?index=trueIn PDF document text
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_158dd33829404a0b8a7b4a0bd4109e9e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nitirew/kovelusaxoxus.pdfIn PDF document text
    • https://b133b025-67d1-4190-9e53-fbb99503dec2.filesusr.com/ugd/caf13f_c72d36a5fae34a66ba589837d21cdd69.pdf?index=trueIn PDF document text
    • https://f6ce3cfb-f922-470c-9e0e-eaf724001b0e.filesusr.com/ugd/defcb2_d7b071cd06734b46b325cae1e547a431.pdf?index=trueIn 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_off0000f892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF892 5260 bytes
SHA-256: 96cd8bdc7e950a66532a3e7a0e0a63f696e5cb84a082777021574485603efc38
font_01_sfnt_off00010a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7C 11016 bytes
SHA-256: 86b1f83068aa531c2c9125c8d4acf37f3e209c05ecac90da46e0227c006e875a