Malicious PDF — malware analysis report

Static analysis result for SHA-256 2437cfd973f29c30…

MALICIOUS

PDF

97.2 KB Created: 2021-05-16 04:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6f2dafa7fcac1ef718f0c36ecd1789b6 SHA-1: 9cb02c67194f4c20118fb553017acbc9963f3cdb SHA-256: 2437cfd973f29c307cd05cdea7d3d6113f97f5ebb56cea1d47a0bb4d0f247237
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 0.9996

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://leonvi.ru/strik?utm_term=5+day+body+reset+diet PDF link annotation
    • https://cdn.sqhk.co/jikikavadaja/m06At02/ma_lighting_effects.pdfIn PDF document text
    • http://lumobumekola.getenjoyment.net/85054190140.pdfIn PDF document text
    • https://cdn.sqhk.co/lididiregi/FFhhggH/vidstatus_app_download_jio_phone.pdfIn PDF document text
    • http://mavafesumej.medianewsonline.com/msc_math_notes.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzosexiwugu/hewidhj/batteries_plus_phone_screen_repair_warranty.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/PibLjcP/clothes_worksheets_clipart.pdfIn PDF document text
    • https://cdn.sqhk.co/puwukuwos/Bjbgfid/scream_granny_barbi_haunted_ice_mod_mystery_houses.pdfIn PDF document text
    • http://kazimibi.getenjoyment.net/23347129702.pdfIn PDF document text
    • http://wudaxozibutix.sportsontheweb.net/konica_minolta_c220_service_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f856bbc4-01c8-45e4-8891-a53c5ee59fd0.filesusr.com/ugd/8e827e_ed39aa9b72a1451f9b2f7938ceede441.pdf?index=trueIn PDF document text
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_465bee2ffceb4b6b826d8d88f1e52850.pdf?index=trueIn PDF document text
    • https://a39ac558-8fe8-437d-9e10-dc9402d6cb9c.filesusr.com/ugd/1ebe14_ab653bfe758c47889db89f36aafc9f84.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/movoliwitajikurubafidas.pdfIn PDF document text
    • https://275320ff-96dd-455a-9699-a0fdc58b27a5.filesusr.com/ugd/943725_618e00e25d5545cea55753aeb812e1a8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/petubapizo/tosisuji.pdfIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/kuxanowasijuwava.pdfIn PDF document text
    • http://tizeruxabono.onlinewebshop.net/ruziwuwuxujegigotalerine.pdfIn PDF document text
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_2186fb49577b4b348aeda2d9f6b78861.pdf?index=trueIn PDF document text
    • https://288dffde-0386-48bd-adba-b069b5f3b70f.filesusr.com/ugd/7e1b39_a122639dc8744e208f896b22939de16c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/97311675325.pdfIn PDF document text
    • https://0eb00d84-361a-45dc-b346-1af5c8eb785c.filesusr.com/ugd/d79848_17686de711994497a9dc78a85e7cfd71.pdf?index=trueIn PDF document text
    • https://36fc1fe3-b646-4cc1-b6e9-de51469aea27.filesusr.com/ugd/3eb4bd_22d108a90a934aa8a71ec158289dd6b3.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F5E 5060 bytes
SHA-256: 10b3be098edfc5084ba6e5d9905ef838fdc6f68b3b2151c41eb19dcda1b62b45
font_01_sfnt_off000150a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150A3 11508 bytes
SHA-256: 3879b8826183122040b0f3b43e299d9b03084411ee44be244d2bad3ff2da3c4a