Malicious PDF — malware analysis report

Static analysis result for SHA-256 146f0470bf972c0d…

MALICIOUS

PDF

71.9 KB Created: 2021-06-06 05:40:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b4a995d40a39c4956553abea699c4d05 SHA-1: 05ef32cd148a3687f273bab6d822c01265d5fc2b SHA-256: 146f0470bf972c0ddad86c4c3dcb4a667d2e949eabd2a6a3015fd2b5f70e5e2e
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://gimoguvi.ru/123?utm_term=deer+crib+sheets+boy PDF link annotation
    • https://pezasagizagifoj.weebly.com/uploads/1/3/5/9/135968908/8187773.pdfIn PDF document text
    • https://pidaxami.weebly.com/uploads/1/3/4/0/134095841/5716029.pdfIn PDF document text
    • https://natedutaz.weebly.com/uploads/1/3/4/8/134850225/jokezoxo-nikijejegok.pdfIn PDF document text
    • https://remejatezikame.weebly.com/uploads/1/3/1/0/131070309/kimusos.pdfIn PDF document text
    • https://wufavupo.weebly.com/uploads/1/3/4/3/134319323/756abdf28c8.pdfIn PDF document text
    • https://wuxuburivoviw.weebly.com/uploads/1/3/4/6/134633524/3688604.pdfIn PDF document text
    • https://duvutonog.weebly.com/uploads/1/3/6/0/136020002/f55cf1b1aac89.pdfIn PDF document text
    • https://duzejuwilana.weebly.com/uploads/1/3/4/8/134879611/97bae.pdfIn PDF document text
    • https://mabajiluvepe.weebly.com/uploads/1/3/1/4/131409333/e1578.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458388/normal_6054736a224e8.pdfIn PDF document text
    • https://jawavovamote.weebly.com/uploads/1/3/4/7/134748122/7959c.pdfIn PDF document text
    • https://mejuxubewa.weebly.com/uploads/1/3/4/0/134041058/debca.pdfIn PDF document text
    • https://kepiloxuxamife.weebly.com/uploads/1/3/0/7/130740378/befisuwewimi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410727/normal_6006bd630ac18.pdfIn PDF document text
    • https://pipulelinukebe.weebly.com/uploads/1/3/4/3/134364851/0cf74d0.pdfIn PDF document text
    • https://jadanimotubow.weebly.com/uploads/1/3/1/8/131856100/laxanoru.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/23e1a4bf-2453-4214-857d-502a0ff4d5cf/48568465133.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d37c5903-49c7-4440-b694-bfab34b4573b/how_do_i_make_my_verizon_remote_control_my_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c074c6d-ef33-49f5-938f-e24e776f9397/how_to_make_invicta_watch_smaller.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4059357-3a7c-4b34-991d-cd154c847fbd/gudowakiwonefovepilogig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccfb798c-9a54-4bb7-8350-ed1336db811d/meade_etx_70at.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cb8fef6-857c-4840-be84-4d659394dac3/wiwaneduse.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_off0000db61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB61 4888 bytes
SHA-256: 799255a393658138bbd3d339d4ac01e34fcd2dbd4d13047bb024995769458e93
font_01_sfnt_off0000ec07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC07 10888 bytes
SHA-256: 4eaefd4031a9985a13bb00adb08eca07f121cd479dd1d180c7609aeb6d6b05da