Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b4312e686e1cdd9…

MALICIOUS

PDF

74.8 KB Created: 2021-03-24 16:07:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6140cfd22a7fc65a078c844489d02b43 SHA-1: 580be03c9be3d86e79c7ec62beb3273eaabd9135 SHA-256: 7b4312e686e1cdd9d925e02c96c25c55ae1397b669f65f61caaf92d508351cdf
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 0.9998

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://ponafet.ru/aws?utm_term=how+do+i+reset+my+samsung+refrigerator+after+power+outage PDF link annotation
    • https://cdn.sqhk.co/nekuripafi/hdfkTgf/7225901321.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/b1p7yNY/75008567366.pdfIn PDF document text
    • http://dompodklyuch.com/rejujigexibo2f2fq.pdfIn PDF document text
    • https://cdn.sqhk.co/wememiguw/gdigjjP/94063819433.pdfIn PDF document text
    • http://gratoramaa.space/mowubaloxevulavawpd5j.pdfIn PDF document text
    • http://jojidasusesot.sportsontheweb.net/casio_pro_trek_prg_270.pdfIn PDF document text
    • http://rixorevu.getenjoyment.net/dupumuxanuvorelozosewo.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/gf3dPji/2173153278.pdfIn PDF document text
    • https://cdn.sqhk.co/vafizolubev/b8jbehe/langrisser_mobile_review.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1ceef7f3-d523-4f80-a0a4-3aed54d3d17a.filesusr.com/ugd/48841a_7d4ae7e2c103425486bc4c886abac077.pdf?index=trueIn PDF document text
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_c6b3fbbecd2e45de99b51d6f61c4dec5.pdf?index=trueIn PDF document text
    • https://32cf4326-ba62-484c-a3ca-05d02c2dd2e5.filesusr.com/ugd/0b46e6_e73e393ea7ac4a419898d786ade431a6.pdf?index=trueIn PDF document text
    • https://dc6b22d1-fd3c-476a-b8f1-b0505981f591.filesusr.com/ugd/ab5adf_c80ba73fd811478dbc150c33dbdcf16a.pdf?index=trueIn PDF document text
    • https://74df6fe0-557b-4e47-8461-f2df536053d0.filesusr.com/ugd/4dcf4e_a4d75d9b33d34f81b9c6dd4f3383af54.pdf?index=trueIn PDF document text
    • http://wigufoxeb.rf.gd/build_my_life_housefires_guitar_chords.pdfIn PDF document text
    • http://zisafaziga.epizy.com/ambaji_ka_garba.pdfIn PDF document text
    • https://06b91503-bda4-4bbd-a69c-520552d4e402.filesusr.com/ugd/07c5d0_a981a5fb46c4415bbd8ae96efaf6f003.pdf?index=trueIn PDF document text
    • http://vimitafukufes.rf.gd/68505120835.pdfIn PDF document text
    • https://c84d532c-3b33-47d6-96aa-4134a1164eb1.filesusr.com/ugd/6d45f6_99cddd5ea8634001a427ca79e5328f48.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_off0000e661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE661 5484 bytes
SHA-256: 11c2ea1d52f9b23d0ea5fd41026880ea820db67002df874d58aa490a36d5ae44
font_01_sfnt_off0000f90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90D 10648 bytes
SHA-256: 472cf4d88f9f48e71fe4e33b8acda9d5117dc0ac5db0e05b9e0901ed7a97f4d8

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