Malicious PDF — malware analysis report

Static analysis result for SHA-256 a045026f83104536…

MALICIOUS

PDF

81.4 KB Created: 2021-03-16 03:54:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d01dd87a80cd1c1fb2e922654f9ab452 SHA-1: 372286ab7f48a18159875bb1845f255197174f8d SHA-256: a045026f8310453672fd24195a1c1143cedddbfa820166c1054698b2c1f83dae
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. The document contains a mass of external links, disguised as a free download for a popular game, likely to lead users to malicious sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vilenefex.ru/award?keyword=warhammer+40k+8th+edition+pdf+download+free
    • https://static.s123-cdn-static.com/uploads/4458148/normal_5fec2ceb43dae.pdf
    • https://cdn-cms.f-static.net/uploads/4448137/normal_603feb677f60b.pdf
    • https://cdn-cms.f-static.net/uploads/4476578/normal_5fe9622d18a9a.pdf
    • https://cdn-cms.f-static.net/uploads/4485152/normal_601548d5ab597.pdf
    • https://cdn-cms.f-static.net/uploads/4417543/normal_6047faaa21ab4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0e01c86c-6ad9-43de-bc04-b8819f410213.filesusr.com/ugd/73c254_b2117f979aee4c349a12009c5359962f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0aea3be6-f88a-4709-953e-33542fca22d0/human_trafficking_statistics_2020_global.pdf
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_67f7a2549e9d4f3fb538d771f1a695cd.pdf?index=true
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_8166a9e63c574aed9edaed39f486bc19.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cb717df8-facc-472a-85e0-155e1b147105/71376979656.pdf
    • https://uploads.strikinglycdn.com/files/02e1b2d1-f001-4dd1-8463-88e90e1b4be6/what_size_tires_for_2016_toyota_corolla.pdf
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_08be35d26e8d42ed90f6f8a9bde425c6.pdf?index=true
    • https://s3.amazonaws.com/boxalewijim/rojufujolux.pdf
    • https://8d2868a3-57b7-484c-81f6-493c1c4f5daa.filesusr.com/ugd/a8ca0f_11e6d33d0fe8405492a932075e689541.pdf?index=true
    • https://s3.amazonaws.com/wuxupewu/50912080357.pdf
    • https://uploads.strikinglycdn.com/files/fed25f39-5d1e-4c00-8a60-0e4a80c1d969/jurizuvozuseba.pdf
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_9b76bbae400741a58c9f2b467db3face.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d1e854e1-1b03-411e-82e0-71c3ab0e8111/24668261105.pdf
    • https://uploads.strikinglycdn.com/files/a8499599-d9e0-4f8c-8a70-ef50a260f7f0/old_school_rap_songs_list.pdf
    • https://uploads.strikinglycdn.com/files/3582c099-7426-410f-81c3-127938010bd2/luxidanopaxuzodiko.pdf
    • https://uploads.strikinglycdn.com/files/5bced7b3-6a4c-4fbb-bf09-94d662ac6ac0/wetepirupelavuwe.pdf
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_a95bc15230d648098425e780a6c81f4e.pdf?index=true
    • https://s3.amazonaws.com/perurulexi/livovapadezeperutefafiw.pdf
    • https://uploads.strikinglycdn.com/files/d0a09788-ea09-4556-967c-4fecc0680e86/what_are_the_multiple_intelligences_and_what_they_mean.pdf
    • https://s3.amazonaws.com/jolunenafobuw/transferable_skills_worksheet_uk.pdf
    • https://uploads.strikinglycdn.com/files/ecdd6de2-f1e4-4b49-be2e-c3117553fb50/wodurotigadipunaxaweziwe.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_off0000fcf8.bin
fd7cbcb9a6c7dbe3b16ab4f9627fadae23bfc86dc5cd2c0aac34043b2f7f82a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF8 5696 bytes
font_01_sfnt_off00011050.bin
3159c3dbf2a5bc61fd1a77a4d2273a0fb93aef9fd4c58a31224def977f80f5f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11050 11604 bytes

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