Malicious PDF — malware analysis report

Static analysis result for SHA-256 13df460dff2a66de…

MALICIOUS

PDF

76.9 KB Created: 2021-03-15 19:59:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 29741c69a26456b17db185320f60805b SHA-1: 365c079fb50f11205044156a3399756273b6d236 SHA-256: 13df460dff2a66de2486bc1d252e39b2088ec058c2bc387079202252ef1f9ff9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a notable one pointing to 'druttle.ru', which is flagged as suspicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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/wix?keyword=rise+of+shadows+reveal+schedule PDF link annotation
    • http://watercart.ru/66571025961ca2ez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415754/normal_6033a3b89252a.pdfIn PDF document text
    • http://instapresent.site/the_caucasian_chalk_circle_full_playii3ty.pdfIn PDF document text
    • http://idealicacolumbia.site/70997430359227x5.pdfIn PDF document text
    • http://trysoda.club/hp_laserjet_m1212nf_mfp_price_south_africaewk3z.pdfIn PDF document text
    • http://rostov-mobile-doctor.ru/lucky_block_mod_minecraft_pe_free_download7u330.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379859/normal_5ff463c706eaf.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/eced3df9-0709-4853-831a-1481e772b2a2/diwefixemedok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17734f3e-59ee-4d44-8e3e-0a9ba04d7a41/easy_chess_game_online_against_computer.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/minecraft_lycanites_mobs_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9f49d3d-8bf4-428a-81a0-7227372146e6/mitchell_collision_repair_login.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16216618-6d1b-4e0d-937b-319b21456ec5/eye_of_the_beholder_twilight_zone_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfe5f985-9d7b-41aa-b759-bb87a45283ae/sandisk_sansa_clip_plus_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/318f4e40-50de-4f78-86c7-7ab7941d8f63/peruwudixad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/026e8cb2-9ef4-4a56-a657-d3411db79174/rorapoluvul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6592388c-6e51-4be9-ac17-c2305892a41d/futoxobusasisifefivek.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/free_adobe_after_effects_templates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e543a8c-2fd5-4a98-8b56-0085dfc1597e/group_theory_in_physics_a_practitioners_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dc14d1d-41ec-448b-9055-eb1079c373df/feziwipumupujibazazepula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/438b999b-b193-4d24-9cb1-f70b4b9f3bd4/hp_laserjet_1536dnf_mfp_error_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3eadf8c8-cb8f-4485-ba83-1a0e3ad982a4/kujikamesux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07ae4df8-1202-41e1-a00d-4a397be9cba5/69844073836.pdfIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/tinunorilorebidal.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/the_help_kathryn_stockett.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_off0000ef3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3B 5268 bytes
SHA-256: 154cc7cf85373f71107ee39c248a31150fed49559eaaf1786717f639e112326c
font_01_sfnt_off00010141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10141 10736 bytes
SHA-256: c7d2b44f2abf70c043dd04ce780ebe989d4d6deaa0a9177c05460c3c5f6aaabe