Malicious PDF — malware analysis report

Static analysis result for SHA-256 55cc68259e15ca34…

MALICIOUS

PDF

74.9 KB Created: 2021-03-21 23:11:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 07e63aa946d05f4d4118d09bc4a94294 SHA-1: ed3424a4593f9aa219f71ad0e0d18506c1b607e5 SHA-256: 55cc68259e15ca342fc18bbc179596b75ed0807a76dff50597f28a040554e1db
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It functions as a link farm, containing numerous external URIs that likely lead to phishing sites or malware downloads. The document's structure and embedded links suggest an attempt to lure users to external resources, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://seumenha.ru/award?keyword=cahier+d+exercices+le+nouveau+taxi+1+answers+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418171/normal_604b582568b8c.pdfIn PDF document text
    • https://debuvubuni.weebly.com/uploads/1/3/4/8/134846467/23e52a655de38.pdfIn PDF document text
    • https://lodovape.weebly.com/uploads/1/3/5/3/135350971/pelozozufo-sixano-xijoxilivekilo-zuwujatidaja.pdfIn PDF document text
    • https://modofanapaf.weebly.com/uploads/1/3/4/6/134676621/3110832.pdfIn PDF document text
    • http://weinmvc.net/adobe_illustrator_cc_2017_32bit_crack_amtlib.dll_free_downloadszxxj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422909/normal_6057006294d3c.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CqLhfN7/localizar_mi_android_por_gps.pdfIn PDF document text
    • https://cdn.sqhk.co/bulelovuroga/cKEhegc/13328410901.pdfIn PDF document text
    • https://cdn.sqhk.co/xusarukave/1dhdGgg/atomic_model_of_oxygen_atomic_number_8.pdfIn PDF document text
    • https://cdn.sqhk.co/kawurefeki/MgfjczO/sonny_liston_reach.pdfIn PDF document text
    • https://cdn.sqhk.co/pumafuki/gcOhbge/42240577592.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/gDhiidH/zombie_crime_shooting_games_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/rawerusiwala/RZjijd5/b._o._t._a._lessons.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470979/normal_5fe4cb126ab11.pdfIn PDF document text
    • https://cdn.sqhk.co/gusejemife/sjhEDgj/negunidev.pdfIn PDF document text
    • http://soldatskaya6.ru/61774304106cqpz1.pdfIn PDF document text
    • http://vannabanyavsedela.xyz/how_to_install_xfinity_internet1cci4.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/sesafefanulokam/coelho_sabido_gratis_baixaki.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/android_searchview_search_icon_color.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/a_train_9_pc.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_off0000d4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F2 5420 bytes
SHA-256: c2f34dab6f2a705771d865770057a04a1e949e364b297ed830d4c19dd7bb9763
font_01_sfnt_off0000e77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77B 14276 bytes
SHA-256: 1734cf99d8f31a5350477090627fe9f64fc7992933af4be3ed9dbdfc8652e5db
font_02_sfnt_off00010ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF4 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361