Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d23397e7a9552f…

MALICIOUS

PDF

69.2 KB Created: 2021-05-03 01:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a9cbc31f48f7cf51b5600d5d8bb6649e SHA-1: 1186d527225a010aea749974c613693738fac885 SHA-256: 18d23397e7a9552f301ce98e084cac901fece217901ca9ec09c9878b0fbc3491
186 Risk Score

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. 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 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://seumenha.ru/strik?utm_term=how+to+change+casio+calculator+into+radians PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367951/normal_602555963ec09.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/hiidUjf/square_payroll_integration_with_quickbooks_online.pdfIn PDF document text
    • https://cdn.sqhk.co/gesokusa/bbjefOZ/xisevafaxipevubape.pdfIn PDF document text
    • https://cdn.sqhk.co/redexisa/ij7jjje/best_nds_emulator_for_pc_free.pdfIn PDF document text
    • https://cdn.sqhk.co/sovanoniwuva/geggejd/76039480531.pdfIn PDF document text
    • https://cdn.sqhk.co/dosazuleg/hjfifhb/99268047922.pdfIn PDF document text
    • https://cdn.sqhk.co/mabisurud/jcGCZK5/blackpink_jennie_outfits.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420245/normal_602e255510529.pdfIn PDF document text
    • https://cdn.sqhk.co/rezeribevi/ijeji9f/jufizefadonu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415080/normal_5fd2e05af02f6.pdfIn PDF document text
    • https://cdn.sqhk.co/gazegarov/uX5hhx0/91253163434.pdfIn PDF document text
    • https://cdn.sqhk.co/dudurejavir/pfHevOJ/49176894425.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374181/normal_604cd0585d344.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mewuxugeje.epizy.com/arctic_wind_portable_air_conditioner_10000_btu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cd90755-372c-4c1b-96be-947dc9047af2/what_does_not_belong_game_online.pdfIn PDF document text
    • http://parezorizujax.rf.gd/pak_army_song_video_3gp.pdfIn PDF document text
    • https://065b66ee-25d8-4381-b309-094abc4d823c.filesusr.com/ugd/2703e6_c5344aba76a04203aa174f187a243c95.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dfb4386-894b-45bc-87e4-65709cac5c64/woterefolavetadasifefuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea341a4f-19df-439c-a784-4e058276c0c0/8774325803.pdfIn PDF document text
    • http://potovoz.rf.gd/2018_toyota_camry_xse_engine_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8518593-338e-4b86-9b69-92616dca58f7/nurojoxoputugoxe.pdfIn PDF document text
    • https://0fdd9f25-8366-4660-9463-376fd915ad39.filesusr.com/ugd/c16cf9_e234c7f6ee84447292c4c4ca9c972596.pdf?index=trueIn 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_off0000c72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72E 2900 bytes
SHA-256: 68d094faf81d2ea9f62e68ee4e789e40b6192f27e323b9e50c58fbaa8f881837
font_01_sfnt_off0000d171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD171 5252 bytes
SHA-256: 80b3036935bc577d17c393cf3872de3155b4a986e4219de542fb5f98027e6894
font_02_sfnt_off0000e357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE357 10368 bytes
SHA-256: 79236f7c7e0c1f9cd994567ba5b2fa309c67f4535a8b7083a9fbd9e9c56f1fb4