Malicious PDF — malware analysis report

Static analysis result for SHA-256 4108eefec8a4e582…

MALICIOUS

PDF

78.2 KB Created: 2021-04-12 23:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96bb892c562c1f34f157bfd60684a787 SHA-1: 549dfa7b017ae51e1c1bdf4c0875abc6dcf881b1 SHA-256: 4108eefec8a4e582807978903705bcf6855c912dd1b7b78cef5d39f52f1deae8
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme designed to lead users to malicious sites. The document body, though obfuscated, contains text related to car sales, likely a lure to encourage clicks on the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://ponafet.ru/strik?utm_term=used+honda+fit+manual+transmission+for+sale+near+me
    • https://gapotijaj.weebly.com/uploads/1/3/1/3/131383657/dasurimut.pdf
    • https://suzipokenefuju.weebly.com/uploads/1/3/3/9/133997801/f38d5e.pdf
    • https://ledajesaler.weebly.com/uploads/1/3/4/0/134041179/wilonedegibonosiviv.pdf
    • http://gizigevom.mygamesonline.org/lekudadafexusunujapu.pdf
    • http://tuduvodakep.mypressonline.com/beechcraft_baron_g58_poh.pdf
    • https://cdn.sqhk.co/semiwewedazi/djd63sf/free_hand_tracing_worksheets.pdf
    • https://nabebumiz.weebly.com/uploads/1/3/1/4/131452902/nolejigasapigaji.pdf
    • https://cdn.sqhk.co/xagaxubibiz/bf9ifhj/galaxy_shooter_space_shooting_for_pc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7ed754b6-a209-4558-9281-0032c7ee8ade.filesusr.com/ugd/4329d7_7540908ec562493dacbd782f76158ea9.pdf?index=true
    • https://s3.amazonaws.com/jitimesolagun/gixumus.pdf
    • https://724418e0-3ace-43c1-abd8-628b4820fc71.filesusr.com/ugd/6df952_b352ce9ae24246bcb2f21545b25af9d3.pdf?index=true
    • http://timagugovoxo.onlinewebshop.net/pieces_rob_thomas_piano_sheet_music.pdf
    • https://315736c7-1030-4200-8d24-05c9f4951019.filesusr.com/ugd/d19ca0_ead6404b33624a4b94d2ddd546a9dc3e.pdf?index=true
    • https://6438efa2-cbc3-4905-bec7-85cdafd94a34.filesusr.com/ugd/d1cf8b_06fe212437c642cc8745233cc083f681.pdf?index=true
    • https://58552d80-c20c-4e4f-99b9-91bedbcc07a3.filesusr.com/ugd/c18496_f025a4bebfd844f6a05448486d7b0e7f.pdf?index=true
    • https://4b5f4e46-8b81-4257-bf39-61fc08ba57b0.filesusr.com/ugd/7ea8bb_67f9ed75c8734afe8ca2089cc28488d7.pdf?index=true
    • https://s3.amazonaws.com/taguxif/bevozaf.pdf
    • https://3d5b2cfc-74f5-4c02-8466-0d369b02955c.filesusr.com/ugd/69b86f_e84515823b4e4668b3e7d02416159c24.pdf?index=true
    • https://s3.amazonaws.com/zosevid/55045372173.pdf
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_2e78a0e6e3ee4a8994a09d74d25d6e52.pdf?index=true
    • https://s3.amazonaws.com/tanapilamaxi/76275939277.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5f4.bin
095d1edc0a086699a85c4d3d1aa07430357103c1c180cb6ca5f483711aa9bfe9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F4 5140 bytes
font_01_sfnt_off00010743.bin
4842055a6a9146803a63254f32d0601c56edf4e548edc00688a28fb4d10a3c0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10743 10564 bytes

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