Malicious PDF — malware analysis report

Static analysis result for SHA-256 44a0a78e6c78180c…

MALICIOUS

PDF

75.9 KB Created: 2021-03-14 17:54:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 47dfb761b427e02d2c6d429380ded001 SHA-1: f55c5da732387b252afa1f8bf688ea09d0933e36 SHA-256: 44a0a78e6c78180c0f3d5990ee049f11492df81d233be79e705874df8ca6138a
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though partially corrupted, contains metadata related to PDF generation and a keyword that might be used in a lure.

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 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://pelibifir.ru/award?keyword=example+of+dedication+and+acknowledgement+in+research+paper+pdf PDF link annotation
    • http://microdigitalmeter.xyz/91910905535e7wo9.pdfIn PDF document text
    • http://biwedujurar.mywebcommunity.org/craftsman_137_table_saw_review.pdfIn PDF document text
    • http://topcreditmonitoring.info/femexezavoopjzw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467564/normal_60286a22730a7.pdfIn PDF document text
    • https://mesasijodise.weebly.com/uploads/1/3/5/3/135315214/lufozezalaxasaj-womatiwusa-vopir-guveda.pdfIn PDF document text
    • http://keksik24.ru/pozaviypn7n.pdfIn PDF document text
    • https://talafifu.weebly.com/uploads/1/3/4/2/134265368/3916558.pdfIn PDF document text
    • http://suzupuwejal.mygamesonline.org/92837048926.pdfIn PDF document text
    • https://tavutapakewig.weebly.com/uploads/1/3/5/3/135399939/mofadobasovuvub-zutorawol-jibaxunilebib.pdfIn PDF document text
    • http://farvestnn.ru/86181544227914ju.pdfIn PDF document text
    • http://neojust.ru/ford_555b_backhoe_service_manualschtj.pdfIn PDF document text
    • http://moresukko.ru/56087576119n2u7o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366646/normal_6000f886e04f8.pdfIn PDF document text
    • https://zabagazepag.weebly.com/uploads/1/3/4/4/134498959/zoruxoxilamav.pdfIn PDF document text
    • http://tikanaw.mypressonline.com/sex_and_the_city_drama_queens_cast.pdfIn PDF document text
    • http://dumigegin.medianewsonline.com/verifone_commander_topaz_training.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jasunusemoki.onlinewebshop.net/sword_art_online_alicization_war_of_underworld_part_2_final_season.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35df6bcb-0d75-4fc6-b56c-39cff4f487d7/52325814482.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/807fa27c-561a-4291-b33f-f8faa9343cc9/how_to_adjust_the_hands_g_shock_watch.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_off0000e8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C4 5752 bytes
SHA-256: 4fd625567af4009e405539d59288c1469a1e9aefddf332021174865ec04a2cf4
font_01_sfnt_off0000fc52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC52 10448 bytes
SHA-256: de68461523f24e4f91ae6472cb385b98e6e40907ee3e451d77856f1a07f55127

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