Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fae1c30b839f180…

MALICIOUS

PDF

79.9 KB Created: 2021-04-04 08:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: af4cc833fc8c89b86e90dc52f5dfc0ab SHA-1: efb8f0967592c2809fd3d78544e9ad27383ff275 SHA-256: 0fae1c30b839f180796f7a5b5bc6bff7eac671bc5ea3ec4f3894ef1cdbdfaeb2
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://dafemum.ru/wix?keyword=rag+quilt+cutting+guide PDF link annotation
    • https://cdn.sqhk.co/mifigatira/mFjgAih/82707668113.pdfIn PDF document text
    • http://yogait.space/slideshare_ppt_freei32l9.pdfIn PDF document text
    • https://cdn.sqhk.co/kugorazig/5PHEGNg/marketing_research_9th_edition_burns.pdfIn PDF document text
    • https://cdn.sqhk.co/domojegibuze/djhjaad/strategy_pattern_java_real_world_example.pdfIn PDF document text
    • https://cdn.sqhk.co/sirojenu/Dthfjhq/vuzesipuvu.pdfIn PDF document text
    • https://dakuzewaki.weebly.com/uploads/1/3/6/0/136089440/1bd824.pdfIn PDF document text
    • https://cdn.sqhk.co/vilosezuj/pJHhhcA/billiards_pocket_rules.pdfIn PDF document text
    • https://zupufirelerige.weebly.com/uploads/1/3/0/9/130969681/0d89c9f79.pdfIn PDF document text
    • http://theraisins.pro/60875756229q4hrb.pdfIn PDF document text
    • http://rastet-malysh.ru/42051340033tgrwe.pdfIn PDF document text
    • https://cdn.sqhk.co/nupegefozub/ggjjhhg/arcade_skee_ball_table.pdfIn PDF document text
    • http://persequen.com/legend_by_marie_lu_series_in_ordero5z2n.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/HifigPW/pixel_dungeon_apk_mod.pdfIn PDF document text
    • https://sijujufe.weebly.com/uploads/1/3/4/6/134696532/1342232.pdfIn PDF document text
    • https://cdn.sqhk.co/lejukujegomi/eThcbja/zaluriboturilowofepuso.pdfIn PDF document text
    • https://cdn.sqhk.co/ditutafewaw/bhbCgh0/cruise_deals_from_florida_2019.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://30621b86-6952-4b41-80af-4d24d830bc7c.filesusr.com/ugd/122077_db0a7aec86fc4d4db2c1ff6fb5092c56.pdf?index=trueIn PDF document text
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_1e5f0c1099114af5bb01f4330ce2ef15.pdf?index=trueIn PDF document text
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_921885a07a314f03993132fd225bf08e.pdf?index=trueIn PDF document text
    • https://206c1dc7-391c-4b20-ac64-b63c97020fd4.filesusr.com/ugd/87773f_f693629b13554b9bb3b9a40bef70a40e.pdf?index=trueIn PDF document text
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_01c10627f4d54d90aeb512e124a3db48.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB83 4968 bytes
SHA-256: 4c683601daf51181579f5ecf12f7bed29dbf2af40ea08c97521bcda87b903dee
font_01_sfnt_off00010c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7A 11052 bytes
SHA-256: 94d0c1f0fc5a86e0a888644c883535a8415100d33a403ee4c7695851cf8c4ae4

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