Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb3e994a709b42b8…

MALICIOUS

PDF

122.4 KB Created: 2021-04-04 16:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 379b0ac66a6bedb54ac7401fd08a06ce SHA-1: cfe6f259eae02630fe8e5a02224f337921677622 SHA-256: eb3e994a709b42b80e0a8fbd36c167d39880dfa9174408d387d6656df033e7eb
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/strik?utm_term=ford+focus+2003+zx3+weight PDF link annotation
    • https://cdn.sqhk.co/losokifape/VjbYiib/mineral_king_loop_trailhead.pdfIn PDF document text
    • https://cdn.sqhk.co/dekaroku/iajicvD/idle_tycoon_space_company_best_crew.pdfIn PDF document text
    • https://cdn.sqhk.co/zapimafe/jficwjc/joc_chicken_invaders_5_online_gratis.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/U9r3hen/starcraft_heat_press_8-_in-_1.pdfIn PDF document text
    • http://nashremont.site/furikewalaxuvaneti13p6p.pdfIn PDF document text
    • http://zafikapasipugog.medianewsonline.com/biedermeier_zusammenfassung.pdfIn PDF document text
    • http://govovimifakine.mywebcommunity.org/41245175083.pdfIn PDF document text
    • http://bred-enligne.com/8133306956w611m.pdfIn PDF document text
    • https://cdn.sqhk.co/jawefujivi/hjjjFwR/47902107523.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/a50bde70-08e6-4384-9f7e-a38dd66ebfe4/61660409831.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c045dd5-c027-4c07-9266-eb15b1c2f669/nupofazik.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/vunumomofuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8758e2c1-f756-40e8-8af7-2c04c4604cea/craftsman_edger_29cc_parts.pdfIn PDF document text
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_042d1d49e422421fa280314fe8741f8b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/afad3d1d-b321-490d-a0d6-ba9ad5379013/spiritual_authority_andrew_wommack.pdfIn PDF document text
    • http://lebusepuwiri.atwebpages.com/difivikosapobema.pdfIn PDF document text
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_c1c3c22588c14748bfa5f3f83fa754f6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/altec_bucket_truck_accessories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8503e8ac-1f58-4902-b5e8-62ac48e3b285/is_cleansing_balm_good_for_dry_skin.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A81 5644 bytes
SHA-256: b2a6b30f9576aefe4a3653deca17345520fdb29a09606ce7d4679ce8aa7828a9
font_01_sfnt_off00019ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DDB 12996 bytes
SHA-256: 2550a8453214263ab489134a7a797031c90f7dd280f327b0ddedb20c762777f5
font_02_sfnt_off0001c7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C7CE 16060 bytes
SHA-256: 2d958bd008b8db5b33092f112e99c856adbcc0a100e950d14ff814b784be6357