Malicious PDF — malware analysis report

Static analysis result for SHA-256 f71a84c662c92a46…

MALICIOUS

PDF

77.7 KB Created: 2021-02-25 20:47:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c169096afc12db0f97bffae6449eec4d SHA-1: 35a57a955902102a03cc43db4240cd7741eaa734 SHA-256: f71a84c662c92a4629de173850d73e784f83cb62632d4d26f29e6e6a6d4ea0c1
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are SEO-themed, suggesting a link farm or phishing attempt. The primary URL, https://jacksth.ru/strik, is likely intended to redirect the user to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

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 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://jacksth.ru/strik?utm_term=toyota+camry+trd+for+sale+san+diego PDF link annotation
    • https://zaxizibu.weebly.com/uploads/1/3/4/6/134672664/4325061.pdfIn PDF document text
    • https://wavoxodasamemat.weebly.com/uploads/1/3/5/3/135348105/zilowesiwi_zegux_jojuxop.pdfIn PDF document text
    • https://gedibixofesona.weebly.com/uploads/1/3/4/6/134688069/xujixuberakuvowekuko.pdfIn PDF document text
    • https://jenifamizoj.weebly.com/uploads/1/3/5/3/135319667/e09b644e99b2.pdfIn PDF document text
    • http://voiprormul.xyz/absorbancia_a_transmitancia_formulaa6jza.pdfIn PDF document text
    • http://repair-kvadrokopterov.ru/10075133030090pb.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/ganubatebedoxez/catering_management_books_free.pdfIn PDF document text
    • http://puxetedategekex.epizy.com/bolt_action_muzzleloader.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/7960900915.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/capture_the_flag_full_movie_480p.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/d_d_adventurers_league_character_sheet_printable.pdfIn PDF document text
    • http://bizifopijosegu.epizy.com/nenenuwagezejidetifunik.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/80562364233.pdfIn PDF document text
    • http://zoxokukazo.epizy.com/indices_practice_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/extent_reports_not_getting_generated.pdfIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/kufemelidetadutabitiwo.pdfIn PDF document text
    • http://jijetebum.epizy.com/jardim_botanico_curitiba_reforma.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_off0000f240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF240 5392 bytes
SHA-256: d93db46e7389e41b36de5d91008afe71edb1b6925c9b67ac319362c42304f799
font_01_sfnt_off0001048e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048E 10756 bytes
SHA-256: 4c46aabd5f9fb6861e94bcddc01abad8368b89d76124e2c8e8d7b4cce81007ed

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