Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c0326584d2b6fd3…

MALICIOUS

PDF

79.5 KB Created: 2021-01-11 09:12:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 024b476396c0200868819776bffce065 SHA-1: ef8d8354e78b0b4a0a7bf07e9ec8a8cf953565c5 SHA-256: 5c0326584d2b6fd319b303e3c00c238137eea3119396189e158307b72beed614
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically appearing as a lure for 'iti delhi admission 2019 date online form'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for numerous links, suggesting a phishing or spam campaign. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious intent.

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 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://trafficel.ru/aws?utm_term=iti+delhi+admission+2019+date+online+form PDF link annotation
    • https://site-1168115.mozfiles.com/files/1168115/90s_music_lyrics_quiz_with_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393186/normal_5fb48f039e701.pdfIn PDF document text
    • https://site-1167927.mozfiles.com/files/1167927/70919509552.pdfIn PDF document text
    • https://site-1178251.mozfiles.com/files/1178251/kelechi_africana_ring_lyrics_video.pdfIn PDF document text
    • https://site-1171771.mozfiles.com/files/1171771/detopiwud.pdfIn PDF document text
    • https://site-1168131.mozfiles.com/files/1168131/20627360040.pdfIn PDF document text
    • https://site-1173463.mozfiles.com/files/1173463/dymo_colorpop_label_maker_staples.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379236/normal_5fe8275f93319.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381098/normal_5fab69234c81f.pdfIn PDF document text
    • https://site-1184420.mozfiles.com/files/1184420/zolazuka.pdfIn PDF document text
    • https://site-1176339.mozfiles.com/files/1176339/zakifixugapuz.pdfIn PDF document text
    • https://site-1168046.mozfiles.com/files/1168046/85593817631.pdfIn PDF document text
    • https://site-1175722.mozfiles.com/files/1175722/xedenuwoxum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384145/normal_5fe58a37c1c1b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/legenapi/mawewivefobikedavupewulat.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/nabijiwafabulujowuku.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/formato_registro_anecdotico_preescolar.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD1 5356 bytes
SHA-256: ee73227cec670ecf697827f853d441b3d6d59b900cb572460c6af9230b2d099f
font_01_sfnt_off0000fed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED0 10464 bytes
SHA-256: 86b7dd38516acc35c399db6e0994b0423bf4a7e7b771809599053f8df320f91e
font_02_sfnt_off0001226a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226A 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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