Malicious PDF — malware analysis report

Static analysis result for SHA-256 08e62d44d3bc9fc5…

MALICIOUS

PDF

73.7 KB Created: 2021-03-25 04:59:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6dc07d201512c872f4ee7da10fb5e9b3 SHA-1: 1707981a48c26984b8f783ce2082e94a89cb5af5 SHA-256: 08e62d44d3bc9fc5af958db37b8af5f42a079970632524708e536dd4b242d1b4
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external URLs, with one prominent URL leading to 'baarspo.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to 'us army flag pictures', likely a lure to entice users to click the malicious link. No scripts were extracted, but the PDF structure itself is designed to host and present these malicious links.

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://baarspo.ru/strik?utm_term=us+army+flag+pictures
    • https://dizuxegukus.weebly.com/uploads/1/3/4/6/134624336/d4bbd5bd.pdf
    • https://gopoxigubujazu.weebly.com/uploads/1/3/0/9/130969754/sikexazage_nivovexalurepip_ligukuv.pdf
    • http://servicesforsupport.com/bubogukaguvuwipamulrs163.pdf
    • http://meine-gebuhrenfrei.com/lolijeriwonufufupc8tt.pdf
    • https://nopolojeg.weebly.com/uploads/1/3/5/3/135349815/d31f4a4.pdf
    • http://idealslimitalia-official.site/28732561988jprnu.pdf
    • http://reduslim-shop.site/reradogi1fl2r.pdf
    • https://bateworolod.weebly.com/uploads/1/3/4/3/134315912/66709.pdf
    • http://idealica-italiaofficial.site/canadian_auto_id_cardoloyd.pdf
    • http://help-mediasupport.com/45962926326m31mi.pdf
    • http://glawerry.online/desaxorefexvzad9.pdf
    • http://cashbackk.site/lipuxogadant0s8.pdf
    • https://dugepawegozil.weebly.com/uploads/1/3/1/6/131606694/146efe2b.pdf
    • http://3-bureaureport.info/too_busy_not_to_pray_audiobookzdfqj.pdf
    • https://bovabesizepin.weebly.com/uploads/1/3/1/3/131383515/340951.pdf
    • https://kixumiziri.weebly.com/uploads/1/3/2/6/132681985/79f35592add.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/10310a99-58bf-44ad-8597-ed51425dade6/74241844285.pdf
    • https://uploads.strikinglycdn.com/files/ab017b8d-4715-45a7-bdee-1a068ab7d072/39876946689.pdf
    • https://uploads.strikinglycdn.com/files/f7c234be-c6dc-411b-b597-44e0d7995eea/pre_kindergarten_printables_free.pdf
    • https://uploads.strikinglycdn.com/files/2c0bbf24-23a6-4e89-a718-3533c39aa593/vegotivolimufezerep.pdf
    • https://uploads.strikinglycdn.com/files/c387f4bb-0c3a-4ef4-81c4-be8c0ce4bfb1/good_ly_words.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1aa.bin
748fe12ba3b81d510663a944475648bd9d9e317d67edd8f8a7f1d9d97a9074ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AA 5428 bytes
font_01_sfnt_off0000f41c.bin
848f615b46ab3fed023fca0d1cb9d74d40b7385506ed4905a8061a5cde8f9600		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF41C 11052 bytes

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