Malicious PDF — malware analysis report

Static analysis result for SHA-256 382aad43b32b1ad6…

MALICIOUS

PDF

75.2 KB Created: 2021-03-19 06:54:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: bf81c6dde26d81e7dcad67cbbedf6196 SHA-1: 9a1e45684987866a4b648591ed4f75e1478b3421 SHA-256: 382aad43b32b1ad61dd77aebfa808f39a8685134cd04d8e13f499546bfb27a3c
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The embedded URLs and the document body suggest a lure for downloading a driver, which is a common tactic for distributing malware. The PDF structure and numerous external links point towards a link farm designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dugedepap.ru/strik?utm_term=hp+laserjet+1100+driver+for+windows+7+32+bit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416140/normal_60491603e1011.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444113/normal_5ffaa1f612315.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475853/normal_600f128300d9f.pdfIn PDF document text
    • http://faniwojelanebe.22web.org/puxoloxafutisowegoki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403557/normal_6027835e20b7a.pdfIn PDF document text
    • https://cdn.sqhk.co/vumuwilaj/vUjfpjg/32469774602.pdfIn PDF document text
    • https://cdn.sqhk.co/dunuxorigu/hhcVugd/bluebird_care_uniform.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494440/normal_6034071253d86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458614/normal_601acbe2b9455.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456687/normal_60477aa748bf3.pdfIn PDF document text
    • http://gomededow.22web.org/civics_ncert_answers_class_10th.pdfIn PDF document text
    • https://cdn.sqhk.co/kepozote/egfjjVz/mhsaa_hockey_playoff_bracket_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457881/normal_5fdb0e6842843.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/rheem_criterion_2_gas_furnace_wont_stay_lit.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/10319556358.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/breakfast_sausage_nutrition_information.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/xogizetilufof.pdfIn PDF document text
    • http://rupevisa.epizy.com/faux_leather_mini_skirt_black_missguided.pdfIn PDF document text
    • http://vipukexevuwe.epizy.com/bmw_e36_parts_catalogue.pdfIn PDF document text
    • http://rebokomixuxoj.epizy.com/cables_cero_halogenos.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_off0000d915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD915 5936 bytes
SHA-256: d10311d49d100b43837c4ab2caadd0977bc65c3c8b96ff10175755fd29dcc164
font_01_sfnt_off0000ed71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED71 15244 bytes
SHA-256: bb3f8154254ac2a1970b59fbd4588a535cce37634fd337d82c13e08ab02bed59

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