Malicious PDF — malware analysis report

Static analysis result for SHA-256 14654a584869cf20…

MALICIOUS

PDF

88.7 KB Created: 2021-03-22 18:41:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 73f74c2deea6a9562ca9b865e63529f3 SHA-1: dcc0a0f1b6ed131b4a0c159e28aa3cd1ed46132d SHA-256: 14654a584869cf2024e2feb39de335a9453c9a1b42f567b0e8e2449a240363b6
164 Risk Score

Malware Insights

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

The PDF file contains numerous external links, indicative of a link farm designed to inflate search engine rankings or distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the heuristic PDF_SEO_LINK_FARM rule point towards a malicious document masquerading as helpful content to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=how+to+connect+a+canon+pixma+mg2520+to+a+chromebook
    • http://vinnipoh.fun/the_little_icu_book_of_facts_and_formulasudfcv.pdf
    • https://zubikazosiz.weebly.com/uploads/1/3/4/7/134761183/4abc00455bd47.pdf
    • http://vezugumak.22web.org/pamunirodamorogiwawakix.pdf
    • https://vowebaxuzifov.weebly.com/uploads/1/3/0/7/130738870/f8ab5.pdf
    • https://jubitire.weebly.com/uploads/1/3/4/0/134017652/9496923.pdf
    • https://cdn-cms.f-static.net/uploads/4467561/normal_601a42b67398c.pdf
    • https://pebufaso.weebly.com/uploads/1/3/5/4/135400671/7085613.pdf
    • http://legko.travel/944381652295klln.pdf
    • https://bebojeraje.weebly.com/uploads/1/3/5/3/135302211/zimuzusome.pdf
    • https://simalono.weebly.com/uploads/1/3/1/8/131856945/1b936f2ca.pdf
    • https://fosewawigikutuw.weebly.com/uploads/1/3/1/8/131871484/3040854.pdf
    • https://cdn-cms.f-static.net/uploads/4409102/normal_603289016cf94.pdf
    • http://jadebey-x.com/2008_jeep_wrangler_engine_bay_diagramdknz4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e99c521b-7dc5-44cd-9117-73c065a63df2/gazekimu.pdf
    • http://xopemaw.rf.gd/xuwogegi.pdf
    • https://uploads.strikinglycdn.com/files/7fa02d3b-d7e3-4f76-bb54-e208d1729b4f/how_to_set_up_a_fishing_rod_for_flathead.pdf
    • http://tinozireru.epizy.com/lonely_planet_japanese_phrasebook_dictionary.pdf
    • https://uploads.strikinglycdn.com/files/64569119-ad93-4d2a-ada7-1e03a2706b3a/64344246032.pdf
    • https://uploads.strikinglycdn.com/files/05127337-ec75-4ba1-88b5-a7864a66946a/pioneer_vsx-5231_reset.pdf
    • http://bividit.rf.gd/game_center_para_android.pdf
    • https://uploads.strikinglycdn.com/files/68259296-8003-4b58-b357-f7e06cc79106/4004652526.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_off000117b0.bin
5dc0cbd97bf4ca6f51e8eeb973318f71698f75e9917417bd1f39c313e917919a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117B0 5860 bytes
font_01_sfnt_off00012b96.bin
ce48b0b8e23abc4b1a50a203540969412a0f62c7a02b91b10323147f642f9fc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B96 11620 bytes

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