Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0c19e154740092d…

MALICIOUS

PDF

88.9 KB Created: 2021-03-03 23:35:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 97e353263d93e54f748d82dff3c6d4ee SHA-1: a78a71cab284a93ee4bf6b4b653f54467baf5ce3 SHA-256: b0c19e154740092d33b73eeb2b23af0bb132e59e6c54b2597ee3c63c7a65e163
186 Risk Score

Malware Insights

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

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 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.
  • 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://jottigo.ru/award?keyword=is+acura+tl+expensive+to+maintain PDF link annotation
    • http://giveaway2020.info/cosco_juvenile_high_back_car_seat4dd3s.pdfIn PDF document text
    • http://haifaiv.ru/vimenegimefugjs46e.pdfIn PDF document text
    • https://nilesezijifata.weebly.com/uploads/1/3/4/8/134885493/gosefe.pdfIn PDF document text
    • https://tazumeter.weebly.com/uploads/1/3/1/4/131438167/a8c0fda84.pdfIn PDF document text
    • https://cdn.sqhk.co/nemizuxe/idijIep/irritating_alarm_ringtone_free_download.pdfIn PDF document text
    • http://vofufime.mypressonline.com/what_is_the_irony_in_masque_of_red_death.pdfIn PDF document text
    • http://manamuposa.getenjoyment.net/are_smart_scales_safe_to_use.pdfIn PDF document text
    • http://zixudivibudizu.scienceontheweb.net/canon_powershot_a720_is_manuale_italiano.pdfIn PDF document text
    • http://immorta-cross1.club/good_food_guide_2020_liverpooli63lx.pdfIn PDF document text
    • https://vekejuritikoj.weebly.com/uploads/1/3/1/8/131857631/8877610.pdfIn PDF document text
    • https://lijupumo.weebly.com/uploads/1/3/4/4/134496400/wusul-dolef.pdfIn PDF document text
    • http://finipupote.mywebcommunity.org/free_digital_marketing_plan_template_word.pdfIn PDF document text
    • http://totalcreditcheck.info/jenigazopotigefijogee6mbk.pdfIn PDF document text
    • http://sewonmedix.ru/automobile_engineering_6th_sem_notesim6k9.pdfIn PDF document text
    • https://nifevokore.weebly.com/uploads/1/3/1/4/131437532/nufibuxisigidiwufa.pdfIn PDF document text
    • https://femanutokit.weebly.com/uploads/1/3/3/9/133999532/9328754.pdfIn PDF document text
    • https://cdn.sqhk.co/wikelere/gib8kpR/53017114152.pdfIn PDF document text
    • https://vigelabed.weebly.com/uploads/1/3/4/3/134368569/givitijomu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kuwijiti.myartsonline.com/15768326342.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_off00012006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12006 5144 bytes
SHA-256: ad5f04287a04e9152dc6043a0e9851c42d4ce446e63020782d6eb5c47b785083
font_01_sfnt_off0001317c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1317C 10672 bytes
SHA-256: 1eac16891b805b12605953194b9efd9797f15b2ee4e95dd43cec3d34beb6388b

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