Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff8d3b1b42ace0d…

MALICIOUS

PDF

82.1 KB Created: 2021-03-18 07:10:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc3160d4246aa7e246fc271938395411 SHA-1: ab82bdebe8b030aee630e24e4c74f600b0fd52d1 SHA-256: dff8d3b1b42ace0dd108caf828477ec26a3acff8099b481f4584218b1cdcca67
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or malware distribution, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_URI' heuristics. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or trojan delivery. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://pelibifir.ru/wix?keyword=endgame+online+free+reddit
    • http://mujudesuxiropa.sportsontheweb.net/articles_of_organization_ny.pdf
    • http://lishop.site/conceptos_basicos_de_estadistica_ejemplosabti6.pdf
    • https://cdn.sqhk.co/bonosexov/gePChbU/75199450005.pdf
    • http://normab-id.com/essential_quantum_opticsehlrr.pdf
    • https://cdn.sqhk.co/xaloridinef/ifIgf0c/43960617383.pdf
    • https://cdn.sqhk.co/wokinuge/bUX5lgc/dead_rain_2_tree_virus_apk_mod.pdf
    • https://cdn.sqhk.co/xixofivib/icicjg9/us_stock_market_tomorrow.pdf
    • https://cdn.sqhk.co/koletexun/cGE7TW7/tibeferaputumomuwuner.pdf
    • https://cdn.sqhk.co/bedogipaxog/eoTqRjh/xomikunobusijalibenifewa.pdf
    • https://cdn.sqhk.co/fodexuxefeba/c681ClJ/jerinevevigedo.pdf
    • http://alluniversity.fun/asphalt_8_apk_obb_apk_awardox59m.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://48bf584d-d56c-45cf-b4f3-c1c05dce5274.filesusr.com/ugd/3f4b99_80b36982892646c8aef29f5c3184f130.pdf?index=true
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_77913b619b954b5dbab45a1987da1978.pdf?index=true
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_dd63fb170e894bc5b89a2aad1e22d01f.pdf?index=true
    • https://c7f0abc7-d23b-482d-bd16-0771495bb668.filesusr.com/ugd/bb13a2_0f9a12ac0669408dbdd2ee6cb96b7395.pdf?index=true
    • https://3bdad275-8828-414d-9063-9532e035d791.filesusr.com/ugd/c67d0c_598624e485b14bcdb13a94d6188f3947.pdf?index=true
    • https://ad843f61-c544-48d7-8cfb-3c048b9edb46.filesusr.com/ugd/0dd9ed_c9418550b45940e788e138e5139728ac.pdf?index=true
    • http://japamitafixe.myartsonline.com/einfache_quadratische_gleichungen_aufgaben.pdf
    • https://48e4e0df-78ce-4736-8797-27735e68dc67.filesusr.com/ugd/f3b179_279b8e9d2e0546f9b14f0b7528c80056.pdf?index=true
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_41cf40e77faa43619a676358d384db73.pdf?index=true
    • http://vuzuwukef.atwebpages.com/29296900292.pdf
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_d53dd33c029a4dcf959db06ac104da8a.pdf?index=true
    • https://54b5936d-992c-4384-b2c5-1391d180f3c1.filesusr.com/ugd/6166c9_2fc67de29fbc4cd383d962fb43f8e869.pdf?index=true
    • 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_off00010348.bin
9789837ede9d1f8974302d99e24aa6633d9bae5dc5433f592f0404794df4e756		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10348 5004 bytes
font_01_sfnt_off00011440.bin
f4e9eef79810afa1b248013f0bd02b43ad6b8d58ae371af067613030502fb2ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11440 11424 bytes

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