Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd1bf16cdf268e1a…

MALICIOUS

PDF

72.1 KB Created: 2021-01-21 04:51:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: f31507c040bbf6627ab95bbc5148f9b2 SHA-1: 68e367905c74aff473be4bf72762b7777eb6aead SHA-256: cd1bf16cdf268e1af84913b304e82564e4c01b9ff3edd041a2d7bf9b9f53da30
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, one of which, https://druttle.ru/wb?keyword=runescape%20upcoming%20treasure%20hunter%20promotions, is likely part of a phishing or scam campaign. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF is part of a link farm on disposable hosting, further supporting malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score suggest a malicious phishing attempt.

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://druttle.ru/wb?keyword=runescape%20upcoming%20treasure%20hunter%20promotions PDF link annotation
    • https://site-1168358.mozfiles.com/files/1168358/pokeball_plus_mew_shiny.pdfIn PDF document text
    • https://webunufilijamo.weebly.com/uploads/1/3/4/6/134677486/54343f774f9ec.pdfIn PDF document text
    • https://site-1248735.mozfiles.com/files/1248735/renunciation_form_philadelphia_pa.pdfIn PDF document text
    • https://site-1172118.mozfiles.com/files/1172118/aarons_rent_to_own_corporate_office.pdfIn PDF document text
    • https://site-1176860.mozfiles.com/files/1176860/best_instagram_tags_for_street_photography.pdfIn PDF document text
    • https://site-1175017.mozfiles.com/files/1175017/jexepegexol.pdfIn PDF document text
    • https://site-1167950.mozfiles.com/files/1167950/funny_gifts_for_mom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zanebinelit.rf.gd/41508494487.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/chamma_chamma_new_video_song_720p.pdfIn PDF document text
    • http://tuninedup.epizy.com/feasibility_study_template_word.pdfIn PDF document text
    • http://nisuzadusidu.epizy.com/washington_state_escapement_reports.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_off0000dd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0F 5324 bytes
SHA-256: aced9142071d5b8c11893a589cf57626ce40b3d03f6a797063d340e76c4dc21c
font_01_sfnt_off0000ef03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF03 10684 bytes
SHA-256: 5f3a8f23ffc24757a0c8652b3b013308f8f91817d9fabe5040cdc7387270125c

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