Malicious PDF — malware analysis report

Static analysis result for SHA-256 652acc6e0d00ece9…

MALICIOUS

PDF

73.9 KB Created: 2021-02-18 05:40:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: f68bddf34694250a88df108c7fa015fe SHA-1: 25708eefbd77dac8010321ac4fce73d08c443d7e SHA-256: 652acc6e0d00ece9332e3fdf38ece217c6da490feacb42676ba93b937fce0668
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are numeric slugs pointing to PDF files, indicating a link farm or SEO spamming technique. The primary URL, 'https://bologen.ru/strik?utm_term=how+to+link+altice+remote+to+cable+box', is presented as a helpful guide but likely serves as a lure to a malicious site. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://bologen.ru/strik?utm_term=how+to+link+altice+remote+to+cable+box PDF link annotation
    • https://cdn.sqhk.co/duponetix/holjbih/zeridapewirar.pdfIn PDF document text
    • http://de-bewertung-id-q2e5t23.top/71341332288gxd2z.pdfIn PDF document text
    • https://cdn.sqhk.co/niduzabunu/jieSjfk/53606029409.pdfIn PDF document text
    • https://cdn.sqhk.co/wabajevebe/jciGgen/vr_water_park_water_stunt_ride_mod_apk.pdfIn PDF document text
    • https://jikezukirex.weebly.com/uploads/1/3/1/3/131383594/kelabat.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/eDOLujf/bagan_myanmar_wikitravel.pdfIn PDF document text
    • https://jeduwenerapowi.weebly.com/uploads/1/3/4/6/134678879/pamififezazijufa.pdfIn PDF document text
    • http://fotonagosuslugi-01.space/76778287985gqhho.pdfIn PDF document text
    • http://indir-kazan.com/petovozarefozadatupesuaonff.pdfIn PDF document text
    • http://thefortykuti.com/volumuwadenidoxoch4i4.pdfIn PDF document text
    • https://tilakajunobeka.weebly.com/uploads/1/3/0/7/130739719/2299995.pdfIn PDF document text
    • https://cdn.sqhk.co/nuxoporerom/6kskgqv/24764089706.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/mexesazaxasa/29310772970.pdfIn PDF document text
    • https://s3.amazonaws.com/tevomenil/xazusebopofuwegelozenot.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/50149263895.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/laxuxiwuxeb.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/55317126452.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/61858066028.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/cisco_spark_board_55_installation_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/tefuxoxusuvozaduropomebot.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_off0000e529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE529 5092 bytes
SHA-256: ac9ce951a83df62384fe9af57f34081e9e47c28b20da10e2e994a73d372ca73a
font_01_sfnt_off0000f673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF673 11000 bytes
SHA-256: e1b503324cf1acfc234c06b03d38824928a4154a31fa3626db3e88fd2db73cb3

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