Malicious PDF — malware analysis report

Static analysis result for SHA-256 79d8cc15a8088daa…

MALICIOUS

PDF

73.4 KB Created: 2021-01-21 10:39:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 540f0379e8e2dfcff8d8885e09db166d SHA-1: ee9918145edb202657995525fc23fb9078e1ffac SHA-256: 79d8cc15a8088daa8f821282ffd56347bcdcafb8f24f81a966224c7abedceb47
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL leading to 'jacksth.ru/aws'. This, combined with ClamAV detection as 'Pdf.Phishing.Trojan', strongly suggests a phishing or malware distribution attempt. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of outbound links, further supporting the malicious intent of directing users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/aws?utm_term=breakup+party+status+video PDF link annotation
    • https://site-1168209.mozfiles.com/files/1168209/67253284730.pdfIn PDF document text
    • https://site-1177498.mozfiles.com/files/1177498/restart_wallpaper_engine_android.pdfIn PDF document text
    • https://site-1176040.mozfiles.com/files/1176040/terminator_2_soundtrack.pdfIn PDF document text
    • https://site-1180408.mozfiles.com/files/1180408/kifoj.pdfIn PDF document text
    • https://site-1248719.mozfiles.com/files/1248719/united_states_history_amsco_2016_answer_key.pdfIn PDF document text
    • https://site-1166653.mozfiles.com/files/1166653/binuj.pdfIn PDF document text
    • https://site-1166728.mozfiles.com/files/1166728/43217346443.pdfIn PDF document text
    • https://gidutuzewefira.weebly.com/uploads/1/3/1/3/131380066/5c2646.pdfIn PDF document text
    • https://site-1177111.mozfiles.com/files/1177111/trouble_tanks_2_unblocked.pdfIn PDF document text
    • https://site-1167954.mozfiles.com/files/1167954/people_nearby_telegram.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/tumasun/39540243384.pdfIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/rusone.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/give_the_plural_form_of_handkerchief.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/1829420103.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/fezob.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/lulonepekof.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_off0000e354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE354 5196 bytes
SHA-256: 055b2537c6dde56391a8ab24a0187e9d320e503cbe4752f8c821587a1f1797cb
font_01_sfnt_off0000f523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF523 10368 bytes
SHA-256: 486025a37cc0e4c61960f3854191fa9d8d46cf073498988ca9e24d58d9115e8c

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