Malicious PDF — malware analysis report

Static analysis result for SHA-256 19ee91814b2b114c…

MALICIOUS

PDF

71.3 KB Created: 2021-02-15 12:45:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 798f89cddb47696abadfd250fdb52c52 SHA-1: 834868357f42f1c848034838f622ad0a85bc7f9e SHA-256: 19ee91814b2b114cf19bd6afa55ec71674cf0742713cce2dca9fe79db5573b81
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are likely part of a link farm designed to improve search engine rankings. The 'SE_CLICKFIX' heuristic indicates the document attempts to trick the user into running a command, suggesting a social engineering pretext. The primary malicious URL identified is 'https://seumenha.ru/strik?utm_term=my+ps3+controller+stopped+working+on+my+pc', which is likely used to download a second-stage payload. ClamAV detection further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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/strik?utm_term=my+ps3+controller+stopped+working+on+my+pc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475391/normal_6021c629701f1.pdfIn PDF document text
    • https://cdn.sqhk.co/kizewetete/SIgeWtR/nike_texas_longhorns_basketball_shorts.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375095/normal_600979df4a79f.pdfIn PDF document text
    • https://cdn.sqhk.co/nilamemiw/jvOxhcO/xejobozebame.pdfIn PDF document text
    • http://kubevevof.iblogger.org/mevorijomafogowimunemudi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464330/normal_5fcf2b72bee0d.pdfIn PDF document text
    • https://sidatenut.weebly.com/uploads/1/3/5/3/135349940/zugifezoro_lejumotup_munon_disuzerojano.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369900/normal_5fdbab2a289b2.pdfIn PDF document text
    • https://kutemipemowu.weebly.com/uploads/1/3/4/8/134860595/3d6ae7.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwunikuneg/ihsZjft/15124378022.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422918/normal_6007ba51e0c3e.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/fopalew/80411780216.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/bakodujupeborize.pdfIn PDF document text
    • http://bawawajabatura.epizy.com/natozir.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/rugipako.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/lowuvefosazatiwin.pdfIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/nawojifaxidoko.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/chemfax_limiting_reagent_lab_answers.pdfIn PDF document text
    • http://jabowedufup.epizy.com/xawek.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/javazisesidoxonedizeruw.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/lr_apk_uptodown.pdfIn PDF document text
    • http://nogomazarem.epizy.com/jingle_bell_rock_music_sheet_violin.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A8 5612 bytes
SHA-256: 6c3116da40a3bbc71a5c237cd63bd7f502cf9e64686f8b9743c830b0988f7544
font_01_sfnt_off0000ecd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD7 10156 bytes
SHA-256: deda08a247d88b8c1714b7aacd72028c28e31d28c10e42a15d734653415b9e9e

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