Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2bd4896b53885c7…

MALICIOUS

PDF

112.1 KB Created: 2021-03-24 01:03:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: dbe1185340b5445f3a4ca5afb97da56d SHA-1: 998fad797631aaecff24caeab45ef1cb04ff7234 SHA-256: b2bd4896b53885c7dd18c61734846f364ee64536aa851af6629488deff295b17
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9977

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://crophysi.ru/strik?utm_term=mechanical+engineer%2527s+handbook+dan+b+marghitu PDF link annotation
    • http://english-10.site/80247882321n2p1m.pdfIn PDF document text
    • http://volazanuva.22web.org/faxugodibemibupuzi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468836/normal_5fcd37d76555e.pdfIn PDF document text
    • http://kimokabif.medianewsonline.com/check_your_aviation_english.pdfIn PDF document text
    • http://italywow.pro/how_to_use_a_rival_electric_food_slicerbewnn.pdfIn PDF document text
    • http://esplus.pro/61483606163rbxhw.pdfIn PDF document text
    • http://citimart.online/the_game_of_life_and_how_to_play_it_summarywdvx9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486969/normal_5fd22dd08e89d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405644/normal_6056b093ad399.pdfIn PDF document text
    • http://mklhhhh.space/44377279229ayhk8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471273/normal_60594f6a1d5af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374207/normal_5fd68dfb11cf2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://4edd92ed-4e96-4c3d-a837-a16c7246ae9e.filesusr.com/ugd/7c3149_af870af2829c4cd798f2d087f13da416.pdf?index=trueIn PDF document text
    • http://sobavetugobi.epizy.com/61858437181.pdfIn PDF document text
    • https://be8414c4-f2d5-40c6-b8a8-1a5561a1dac7.filesusr.com/ugd/a452ea_44a5cd1d43874471b6b6470adf7fde24.pdf?index=trueIn PDF document text
    • http://dakafatuvuguviz.atwebpages.com/wejusibiwurugu.pdfIn PDF document text
    • http://wugemoka.rf.gd/command_prompt_codes.pdfIn PDF document text
    • https://042e50b4-45d0-4577-915a-c14d43ab21ad.filesusr.com/ugd/18f527_229e8fbe797c41d787dd72ebb1cd41f9.pdf?index=trueIn PDF document text
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_cf7d412ea6134807a09a6f12a3d334e3.pdf?index=trueIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_72292e5923fa43c785065068f2f1b771.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xokebore/d_c_a_ka_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/84904563272.pdfIn PDF document text
    • http://lerumedinopox.onlinewebshop.net/46450760545.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F34 5476 bytes
SHA-256: d81af09696ed1548b9d6fbc4021e8a988936b086c89d53c0f64e74bb1e7cb103
font_01_sfnt_off000161a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161A3 13436 bytes
SHA-256: dab26150b1972762a7a9c4d91fa6d435ee9ed8f7bcae2a29a178d4d8e12df0b8
font_02_sfnt_off00018ee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EE5 16068 bytes
SHA-256: 5bf3a568f44d28d5e01ddeb8052344ebf10f005948c245798f42be0336ee4cd8
font_03_sfnt_off0001a383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A383 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f