Malicious PDF — malware analysis report

Static analysis result for SHA-256 571deb3fe825b437…

MALICIOUS

PDF

116.2 KB Created: 2021-02-27 00:44:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a0cf1b3b72651dfb2bf844ea42ae314f SHA-1: 558ed0bc5d62f095f24c6bf7ce0ee773aa9d1a9a SHA-256: 571deb3fe825b4375845312bb0861c49b3b1d669e62456d77e1e2a1ffffbf240
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/123?utm_term=what+is+game+theory+in+politics PDF link annotation
    • https://cdn.sqhk.co/dozumapufa/XNzgigj/23828989090.pdfIn PDF document text
    • https://cdn.sqhk.co/kiribikiv/hgBhfZl/vapenamezizisuwo.pdfIn PDF document text
    • https://cdn.sqhk.co/sepokafaru/cjhbhdY/revexeje.pdfIn PDF document text
    • http://bojelopiroxi.22web.org/30942282465.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/Pgfjbkp/torodapibojoxunekobeb.pdfIn PDF document text
    • http://pivawazuki.iblogger.org/acc_lipid_guidelines_2018.pdfIn PDF document text
    • http://tujofifebituxuv.22web.org/67376677897.pdfIn PDF document text
    • http://xedeporib.medianewsonline.com/7992594178.pdfIn PDF document text
    • http://kekukuxowan.22web.org/56653462753.pdfIn PDF document text
    • https://cdn.sqhk.co/jatizaru/c4jg5hi/raminupavorixogev.pdfIn PDF document text
    • http://vibuluvizawo.66ghz.com/34337302236.pdfIn PDF document text
    • http://kovuzaxaf.medianewsonline.com/25702980227.pdfIn PDF document text
    • http://fazejajogavu.medianewsonline.com/xupakosip.pdfIn PDF document text
    • http://sigisuzuk.getenjoyment.net/how_to_rune_magic_knight.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gurabagoderes.atwebpages.com/would_work_better_synonym.pdfIn PDF document text
    • http://vexabimumemig.atwebpages.com/how_to_replace_a_washing_machine_agitator.pdfIn PDF document text
    • http://kubemumibesedu.epizy.com/channa_mereya_film_full_hd.pdfIn PDF document text
    • http://zuwosopawekaz.rf.gd/41744511025.pdfIn PDF document text
    • http://tozuduxaxikagik.rf.gd/east_west_play_6.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_off00017db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DB6 3208 bytes
SHA-256: 5e550024c0039b8314c6c3ebb79e8d21fd47fba346157369c5d3d1c527c3b0eb
font_01_sfnt_off00018927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18927 5464 bytes
SHA-256: c489d13b21cafe94431b4ecb241c94d0698d0de0189429500f932464d7a1ea34
font_02_sfnt_off00019ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19BA7 11524 bytes
SHA-256: 71a00566b52e1f3c618db19db2120039cde310101cb40cd0afd3845442e84a7d

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