Malicious PDF — malware analysis report

Static analysis result for SHA-256 97de86ac20640c8f…

MALICIOUS

PDF

68.8 KB Created: 2021-03-01 22:22:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2cdf0566fcfe3c9a37c85838c5d1f765 SHA-1: 3820d6e23a1e89b0e3756e99e177c66db510543d SHA-256: 97de86ac20640c8f38d04499b7c6abac618a47f0f310cafd9a7eea123e2ba4ef
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the true destination through a network of disposable domains and UTM parameters. While no scripts were explicitly extracted, the presence of embedded URLs and the overall detection profile strongly suggest a phishing or malware distribution attempt.

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://gimoguvi.ru/strik?utm_term=old+school+bagel+yale+tulsa+ok PDF link annotation
    • https://cdn.sqhk.co/mitukutowum/ijcjfhg/gmail_log_into_different_account.pdfIn PDF document text
    • http://copriyghtconfirmed.com/23169792524g16hz.pdfIn PDF document text
    • https://vikakexotokipo.weebly.com/uploads/1/3/0/9/130969200/nujifevoni.pdfIn PDF document text
    • https://gavozosalaz.weebly.com/uploads/1/3/1/1/131163920/fanavowewidit.pdfIn PDF document text
    • http://nelawetazabuta.66ghz.com/alarm_lock_trilogy_t2_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389604/normal_602c2a2bbe798.pdfIn PDF document text
    • https://cdn.sqhk.co/gupukutolet/bkJhhif/road_to_legend_rules.pdfIn PDF document text
    • http://onlinetyz.xyz/kamuredajagazi25fed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481072/normal_5fd18c252c567.pdfIn PDF document text
    • http://pravagims.net/futipapujutafsh05p.pdfIn PDF document text
    • https://wawogikaso.weebly.com/uploads/1/3/4/7/134726687/6688790.pdfIn PDF document text
    • http://damapilob.iblogger.org/canavalia_ensiformis_como_abono_verde.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pisisagul.epizy.com/itv3_tv_schedule_guide_listings.pdfIn PDF document text
    • http://teveniwavabubak.rf.gd/catholic_answers_conference_schedule.pdfIn PDF document text
    • https://s3.amazonaws.com/dazawojob/verbos_en_ingles_presente_perfecto_y_pasado_simple.pdfIn PDF document text
    • http://sufizewuwavibu.epizy.com/fupimafovelo.pdfIn PDF document text
    • https://s3.amazonaws.com/wisuw/takar.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/billie_eilish_live_performances.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/chemistry_olympiad_2018_answer_key.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_off0000cf35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF35 5440 bytes
SHA-256: 39dc482d8d6b30e6cfaa91fa15fad7c32514df7d6fcd1a16d5253ecde35be7c9
font_01_sfnt_off0000e1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B7 10476 bytes
SHA-256: 8218c1308eb56cc8cdfe164961f89eb1e0440871989378c93a2b2445f784f797

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