Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8aac83e8d656062…

MALICIOUS

PDF

78.7 KB Created: 2021-06-03 21:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7e97ade7e2cbd6efa88bfa5ea112d810 SHA-1: 1ea6e58e64e8b3bafbdf2b30551867f5a9fcbd33 SHA-256: d8aac83e8d656062e3c0d19d3b193f83706ed5a98f1bca0a0dc27072dc6bf484
226 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://lozipotod.ru/123?utm_term=swash+plate+axial+piston+pump+pdf PDF link annotation
    • https://diwapaxifok.weebly.com/uploads/1/3/4/4/134488462/6fb1f83f70dad3.pdfIn PDF document text
    • https://rovagurepuj.weebly.com/uploads/1/3/1/8/131856033/8293e.pdfIn PDF document text
    • https://jajotijodagiwox.weebly.com/uploads/1/3/1/3/131384424/3daed8.pdfIn PDF document text
    • https://todoxaladavefuk.weebly.com/uploads/1/3/4/5/134529573/dubopek.pdfIn PDF document text
    • https://vosafezedivoko.weebly.com/uploads/1/3/6/0/136095507/rupap_vonigorelig.pdfIn PDF document text
    • https://xojumemusip.weebly.com/uploads/1/3/4/0/134018475/b4180689aef0e.pdfIn PDF document text
    • https://vopovotapo.weebly.com/uploads/1/3/5/3/135324672/6ac1f6deeacc6.pdfIn PDF document text
    • https://bofazereb.weebly.com/uploads/1/3/4/6/134675062/wixexi_dewuwu_tadusij_janetepuzemar.pdfIn PDF document text
    • https://nosozekime.weebly.com/uploads/1/3/4/6/134634018/zedimejisujexune.pdfIn PDF document text
    • https://galatowev.weebly.com/uploads/1/3/4/3/134325578/wogazo-nofaxepori-bilow-dijuvunativaw.pdfIn PDF document text
    • https://taduravepe.weebly.com/uploads/1/3/4/7/134714340/gavoxelovara.pdfIn PDF document text
    • https://mitexasax.weebly.com/uploads/1/3/1/8/131857270/kuvawojukowi-dobevipab-widuvulipufa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/97b78d97-7ce2-4da4-882c-deaf492dce2b/vakebazekuka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5328ef98-e012-47a9-8568-2574a8a775f8/nonorevuwevodutizo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dd5b348-ae1f-4f1a-aaa7-1a53e4874882/43475091599.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/281690c0-1c0f-408b-96f4-7bb04160068e/pezub.pdfIn PDF document text
    • http://zepadatoju.pbworks.com/f/what_is_the_best_free_anatomy_app.pdfIn PDF document text
    • http://mosijiv.pbworks.com/w/file/fetch/144423996/carrom_disc_pool_aim_hack_version.pdfIn PDF document text
    • http://lopofemusun.pbworks.com/w/file/fetch/144519639/icloud_activation_lock_removal_free_tool.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc79ba0f-2706-4970-a7ea-d38ad7ab3410/marlin_336_xlr_specs.pdfIn PDF document text
    • http://mefijunov.pbworks.com/f/40031736624.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/059f2df5-6783-4456-a24e-ab4c9dda7bef/97033368974.pdfIn PDF document text
    • http://zajozote.pbworks.com/f/gramatica_b_the_verb_ir_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddce373e-0bb8-4edc-91e9-dd425b90d23f/2875556242.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_off0000f669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF669 5448 bytes
SHA-256: 5bb662ac39f33feec1d88e8f5a9de4f6552793f48e364b88a237c06c43b44139
font_01_sfnt_off000108ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EA 10572 bytes
SHA-256: 5272d6aef98cb267548173a31b057114b594438d1de680499d2e25b602059245

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