Malicious PDF — malware analysis report

Static analysis result for SHA-256 439b5842b7c5df38…

MALICIOUS

PDF

83.7 KB Created: 2021-06-01 10:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 215d72c645d4a0381247ea8a5c7d85f8 SHA-1: 3072a09e20e1d6130991351faf54f4de9f46a7c7 SHA-256: 439b5842b7c5df383d9f7c608aab882d80a1d6ddd9f0e01443af9bef0dbc1bd5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or phishing attempt. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to direct users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://drafthe.ru/pbw?utm_term=how+are+jersey+numbers+assigned
    • https://bimidupixujeg.weebly.com/uploads/1/3/4/3/134319160/d6b78d9e3bb.pdf
    • https://kelodulelonax.weebly.com/uploads/1/3/4/6/134644310/7534959.pdf
    • https://jetosopotow.weebly.com/uploads/1/3/4/0/134018613/e8224ffde3.pdf
    • https://cdn-cms.f-static.net/uploads/4371258/normal_603c0b49cf1a9.pdf
    • https://bewupisobafa.weebly.com/uploads/1/3/5/3/135340617/nekiwivunusabiv.pdf
    • https://cdn-cms.f-static.net/uploads/4385437/normal_606df11f81c73.pdf
    • https://gadakuvinud.weebly.com/uploads/1/3/1/8/131871823/ziwol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kipizasuzeda.pbworks.com/f/perfumes_the_a-z_guide_2018.pdf
    • https://uploads.strikinglycdn.com/files/8f1c7614-3571-4f32-a395-0d722cf5d804/josurusokurafosodapa.pdf
    • http://gudikijuruf.pbworks.com/w/file/fetch/144447405/jakili.pdf
    • https://uploads.strikinglycdn.com/files/e31d0bc0-eafb-4cc2-87c8-11df9530ffea/julijemazoga.pdf
    • https://uploads.strikinglycdn.com/files/253e9183-2a79-49e9-bfa4-6c4b56da28a3/19197599122.pdf
    • http://zegugas.pbworks.com/w/file/fetch/144411423/taboo_midnight_card_game_rules.pdf
    • http://tubekikewabi.pbworks.com/f/xijulobimi.pdf
    • https://uploads.strikinglycdn.com/files/4b84d0ac-0a6d-4856-bf86-28df9af6282f/ferisugitebewek.pdf
    • http://mibegenav.pbworks.com/f/90297808777.pdf
    • http://jesababa.pbworks.com/f/vudubifewitilajazi.pdf
    • https://uploads.strikinglycdn.com/files/5be7365a-14ee-4225-aae4-196d7e2c969f/16459717997.pdf
    • https://uploads.strikinglycdn.com/files/4f4c4510-16a0-418f-b4f9-d93ab1aa8ed3/jibobawi.pdf
    • http://tazijebep.pbworks.com/w/file/fetch/144419589/water_bottle_flip_challenge_baby.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_off00010a52.bin
cc489278523e05a02f70d30cf7dce862c713ba8ab1990624e561200021485bd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A52 5484 bytes
font_01_sfnt_off00011cf7.bin
19a95103a149f6afbf06ef67abbac7cb9067bd0c17a34ad9ee749fbeaede3bcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF7 10724 bytes

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