Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff84bf917661c3f…

MALICIOUS

PDF

82.9 KB Created: 2021-04-08 07:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f78b0ee4e5d10e6a6060a3d017a4cee SHA-1: dcbd30c0c873c422e364d7c6b0d26fff7e242e3f SHA-256: 4ff84bf917661c3fcfd7dca1aad864356051f1d90817c5ef34a7dc894c095770
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a ClamAV detection and an ML classifier. It contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. One of the extracted URLs, 'https://druttle.ru/wix?keyword=diablo+3+builds+reddit', appears to be part of this link farm. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest an attempt to lead the user to a malicious resource, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wix?keyword=diablo+3+builds+reddit
    • https://womegirig.weebly.com/uploads/1/3/4/5/134506381/tovazik.pdf
    • https://jakugogafezokev.weebly.com/uploads/1/3/1/4/131437362/256782.pdf
    • http://net-klientov.ru/hunger_games_catching_fire_full_movie_free_streamingp44cm.pdf
    • https://static.s123-cdn-static.com/uploads/4384469/normal_5fcf838201908.pdf
    • https://cdn-cms.f-static.net/uploads/4375197/normal_606b487f98153.pdf
    • http://aicberg.net/definition_of_operations_researchlz71w.pdf
    • https://cdn-cms.f-static.net/uploads/4424007/normal_6051b674651ce.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/suzujewa/bruselas_mapa.pdf
    • https://7b4e975e-109f-4397-a679-93e438ff1453.filesusr.com/ugd/c33f71_ebaaad5bd0a249068ed30e9a263f2dda.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c1251250-a690-4e1e-9247-ab261fa77e0b/wiziwemidonojojabeluk.pdf
    • https://s3.amazonaws.com/babuxufarizuxur/rafalosokawovilezos.pdf
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_a6b1958817904b36b7f386117f6081da.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7d791311-afd1-4dae-b20e-364727942a36/what_is_the_hidden_oracle_about.pdf
    • https://uploads.strikinglycdn.com/files/82798669-6258-4e69-b709-49d3a2210933/how_to_connect_a_powera_wired_controller_to_xbox_one.pdf
    • https://e42ce0b3-f376-4cb5-9abe-507fdbb9570c.filesusr.com/ugd/603474_792467e9be6e486c8b02848b4209757d.pdf?index=true
    • https://0f4267a5-27df-427f-b7ff-de3c6d4a4cd0.filesusr.com/ugd/9e4921_e5d57faabcdb411a910e70ad4a230402.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b77e9df4-a4b7-45d4-918a-a60483db9734/adventure_escape_hidden_ruins_chapter_6_walkthrough.pdf
    • https://uploads.strikinglycdn.com/files/5e96de5e-0425-4c77-a3ee-1b5a80fb36d0/how_many_decibels_is_a_kitchenaid_dishwasher.pdf
    • https://s3.amazonaws.com/veraxawewib/demonstrative_pronouns_worksheet.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_off00010828.bin
5e6763ddddacf1b3a3b921320a6fc298907bd36c894270f8c0676cb1c5c34de6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10828 5120 bytes
font_01_sfnt_off0001199d.bin
609aca9c3753de78a00715cb82513bc5aee284fe89588eed425af8d3913cbba0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1199D 10864 bytes

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