Malicious PDF — malware analysis report

Static analysis result for SHA-256 b908d391b80f1f0f…

MALICIOUS

PDF

77.9 KB Created: 2021-03-18 07:28:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 56e392e556f57a45b9bb0956df60e843 SHA-1: e6bd914d9bcda29a5c3a4cf16709f6ba2ea7fac5 SHA-256: b908d391b80f1f0f9a4c0fddef23c707c715fbd4466b061a56d6ca29237ad1f1
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-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://midufefew.ru/wix?keyword=crusaders+of+the+lost+idols+talents PDF link annotation
    • http://getbuiss.online/bergamasca_uccellinicgkew.pdfIn PDF document text
    • https://cdn.sqhk.co/didowolikex/0nMihXG/magixeliju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474979/normal_603c686d9e8e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380088/normal_604186473491b.pdfIn PDF document text
    • https://cdn.sqhk.co/powirafawume/hdKXjEi/14854232696.pdfIn PDF document text
    • http://bitiwiz.medianewsonline.com/revised_auto_rickshaw_fare_chart_in_delhi_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486367/normal_603b6f7ad00ce.pdfIn PDF document text
    • http://citrus-fruit.space/different_types_of_communication_channels9il2l.pdfIn PDF document text
    • https://cdn.sqhk.co/rureroso/jfjdXhc/download_nba_basketball_for_java.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369166/normal_602be924e31da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458826/normal_5fe99fd4dcf67.pdfIn PDF document text
    • http://marketeuro.pro/android_update_for_samsung_note_9j65zj.pdfIn PDF document text
    • https://cdn.sqhk.co/wifinalimow/gggeP86/bad_piggies_hacked_sandbox_online.pdfIn PDF document text
    • https://cdn.sqhk.co/dowepigakaw/iRmhfgd/kenejuxeluzoxolodimizose.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4121a797-204a-431c-92a8-8e24072fb342.filesusr.com/ugd/b972d5_f42f95e253304deebdd2572a15bb17d4.pdf?index=trueIn PDF document text
    • http://kubowulurarekij.myartsonline.com/how_much_does_a_new_bobcat_cost.pdfIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_78ae2d2e5f9845f7843f40e2f4255afb.pdf?index=trueIn PDF document text
    • https://6448a590-b571-4b71-a9e4-820b8531b153.filesusr.com/ugd/782be2_7c33c4b02dc54198a818781f69a203d0.pdf?index=trueIn PDF document text
    • https://3794eb9c-cc8b-492c-aecc-44533f76aaa6.filesusr.com/ugd/1ee69b_f6b352e462cc442a9a797105be54a63d.pdf?index=trueIn PDF document text
    • https://04a80c79-134c-446e-801b-0c1635678e59.filesusr.com/ugd/5cebf8_316250f913764c68ba55f2d084a60314.pdf?index=trueIn PDF document text
    • http://tizeruxabono.onlinewebshop.net/functional_resume_template.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_off0000f43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43F 4900 bytes
SHA-256: 95b001ccbba9f00ae5f5db26c3bb6c3ee5f6779d4b69a0cec1414264e8e5c317
font_01_sfnt_off000104dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DD 11040 bytes
SHA-256: ba58eb505a4cfcf1417ca661b58871a85d026a8476cccc6f1de1a2539a243a29