Malicious PDF — malware analysis report

Static analysis result for SHA-256 24c2c8f9aaed8903…

MALICIOUS

PDF

76.3 KB Created: 2021-03-08 18:53:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 7f45946065bcd2c11a5fe64747f95399 SHA-1: 57a9e1ce279444735667362a0d4d301347f9f1a1 SHA-256: 24c2c8f9aaed8903cf2b82ce517db8ef5aeefa6e0871e97432121bc493fd0777
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to statistics, aiming to trick users into clicking the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://gimoguvi.ru/award?keyword=bivariate+data+in+statistics+pdf PDF link annotation
    • https://gusobenatidisa.weebly.com/uploads/1/3/4/4/134475091/gesepogemajegeravi.pdfIn PDF document text
    • https://fewirikikekaja.weebly.com/uploads/1/3/2/3/132302896/mifese-wogatele.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454544/normal_6036a09f8320b.pdfIn PDF document text
    • https://sisezapude.weebly.com/uploads/1/3/1/3/131398367/buxix.pdfIn PDF document text
    • https://tobisimotar.weebly.com/uploads/1/3/5/3/135330661/lakogusabivibuj.pdfIn PDF document text
    • https://xekekulok.weebly.com/uploads/1/3/1/8/131857590/tezax.pdfIn PDF document text
    • http://cleaner360.shop/connect_the_dots_with_4_lines_answerpbo1d.pdfIn PDF document text
    • http://stakingyfi.com/dragon_quest_dai_episode_1olov4.pdfIn PDF document text
    • http://granitmetrospecstroy.ru/das_wunder_von_bern_wer_schoss_die_toreysuzk.pdfIn PDF document text
    • http://reduslimitaly-official.website/google_technical_project_manager_interview_questions4fpor.pdfIn PDF document text
    • https://verulezame.weebly.com/uploads/1/3/0/8/130814285/864368.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480155/normal_601830fdd8c46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411490/normal_5fe90feed8117.pdfIn PDF document text
    • http://storeeu.info/142918341557ux4q.pdfIn PDF document text
    • https://navuvosukogeguf.weebly.com/uploads/1/3/1/4/131454151/ef9aae6b.pdfIn PDF document text
    • http://islta.fun/77291702897p312a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402289/normal_5fce26b1c6183.pdfIn PDF document text
    • https://rupugafes.weebly.com/uploads/1/3/4/8/134847604/120ed4df.pdfIn PDF document text
    • http://bighome.space/dupimulawezorono8bdsl.pdfIn PDF document text
    • https://rexawalifutox.weebly.com/uploads/1/3/4/4/134458468/lanozuduvobif_gejib_bigafajalab_zufiziji.pdfIn PDF document text
    • https://xanusikufugab.weebly.com/uploads/1/3/4/3/134371049/9481250.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420600/normal_5ff0751ed1ee2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tudalumovadir.epizy.com/tejilulibidowujalufelenuj.pdfIn PDF document text
    • http://rabuwupitakif.rf.gd/53159666954.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_off0000ee71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE71 5228 bytes
SHA-256: c861996bae74bda6ae904d762b6defe881353a1168821972607c0d2441a8446b
font_01_sfnt_off00010056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10056 10332 bytes
SHA-256: 6af7d5f28cda6185142d114cd55a06de729a4248e417ead29f962f56a8357ee8