Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6a962a9edc908b2…

MALICIOUS

PDF

72.7 KB Created: 2021-01-31 02:05:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e07da3e745ed18464966b1598f7befd0 SHA-1: 67c6cbeae56ad9513229b9af6b57b298f1a16cf6 SHA-256: a6a962a9edc908b2f1fbd2052e9c62f84f861b063dbf41ab2a35313e7eb1ff64
126 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs, with a primary one pointing to 'baarspo.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a second-stage payload via the embedded URLs.

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://baarspo.ru/aws?utm_term=social+skills+worksheets+for+adults+with+autism PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368768/normal_5fcd6ee8c3e31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465543/normal_600bbad9e5dc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417664/normal_5fe7f4969afc5.pdfIn PDF document text
    • https://cdn.sqhk.co/sewetotab/shhtieQ/18391566907.pdfIn PDF document text
    • https://degugelusejife.weebly.com/uploads/1/3/2/6/132695568/5594945.pdfIn PDF document text
    • https://tolajugim.weebly.com/uploads/1/3/4/6/134647220/8397594.pdfIn PDF document text
    • https://cdn.sqhk.co/baluwofuk/ev8gfhc/suxij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379369/normal_5fd13ab7c023c.pdfIn PDF document text
    • https://cdn.sqhk.co/pejozujemu/Hvhbji5/11079302798.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496828/normal_5fd86cad75ac7.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/rojalexipokadaz/94602437922.pdfIn PDF document text
    • http://zumewozuzetarun.epizy.com/alien_shooter_2_full_game.pdfIn PDF document text
    • http://dakiwadizadenig.rf.gd/charminar_telugu_movie_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/minimalism_lifestyle.pdfIn PDF document text
    • http://zovaner.rf.gd/21152370139.pdfIn PDF document text
    • https://s3.amazonaws.com/tulosa/gejoguw.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_off0000cf5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5A 5296 bytes
SHA-256: fb0074eb4759d152313234b601f398fc23f0d0f739b999cc1b548f092e2531ca
font_01_sfnt_off0000e15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15D 11464 bytes
SHA-256: 64072e4051ea92ddf78dc690353475aec5eaccd8481088fe54d25a70cdbb7346
font_02_sfnt_off00010775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10775 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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