Malicious PDF — malware analysis report

Static analysis result for SHA-256 1803933ca7f54213…

MALICIOUS

PDF

78.3 KB Created: 2021-04-30 09:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 94a9bb0e4f40a9a196808ab49c83323d SHA-1: 20571a21044029041015e7a4d46e67574a02876f SHA-256: 1803933ca7f5421381d2102f133e0a768eb540717478a4fc013e581097adccc6
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, characteristic of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. The embedded links likely lead to malicious sites designed to steal credentials or distribute further malware.

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://resalured.ru/strik?utm_term=why+won%2527t+the+backlight+on+my+keyboard+work
    • https://cdn.sqhk.co/titesojijuko/edt4SdM/visual_studio_code_login_account.pdf
    • http://1-bog.ru/wadawufivudajotutw80fc.pdf
    • https://pinowutofabu.weebly.com/uploads/1/3/4/7/134763632/vinativuzeda-wixidon-zamekewuzuvo-vakibipudili.pdf
    • https://gefaturulabi.weebly.com/uploads/1/3/4/4/134487578/solorutiruzez_duberusej_bazovuruse.pdf
    • https://cdn.sqhk.co/dasofuduveje/ehfjfjf/racer_1000_for_sale_craigslist.pdf
    • https://cdn.sqhk.co/gozajare/bDIjijh/68081254228.pdf
    • http://matras-24.ru/mifoko2ckd7.pdf
    • https://vosovijuz.weebly.com/uploads/1/3/0/8/130813614/f206cc3d8f62a.pdf
    • https://cdn.sqhk.co/bazexolareja/ihtMifE/51079709104.pdf
    • https://tifalexax.weebly.com/uploads/1/3/4/4/134471923/josezunobekiwo.pdf
    • http://spindlndou.space/nalixalazikoqrad3.pdf
    • https://kemusasozez.weebly.com/uploads/1/3/0/9/130969555/zajawejirukizixe.pdf
    • https://cdn.sqhk.co/wuzufoxo/fjbHmgi/diablo_3_season_14_chapter_guide.pdf
    • https://cdn.sqhk.co/botonerepap/gigeENr/ranch_rush_sara_s_island_experiment_online.pdf
    • https://cdn.sqhk.co/norowitidot/iaCieid/ludo_app_online_play.pdf
    • https://nobenegutebofem.weebly.com/uploads/1/3/4/6/134615432/4126e6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c332f546-81c1-41d6-9ce0-7413c9d8e757/976077917.pdf
    • https://uploads.strikinglycdn.com/files/8f9dc73d-3236-4f00-b346-93d1c9da2eb4/25284156958.pdf
    • https://uploads.strikinglycdn.com/files/dd7708ae-8499-4d43-934a-47b3db7fbbd2/sisuvusozuta.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_off0000f2e5.bin
2d57596bf693c2f61378d4a75515c3d049408addb75929fd94f7a41b355710ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E5 5620 bytes
font_01_sfnt_off00010605.bin
179d033ac96615490bd786157c41983f9b8119084b3a351b2cf225689525f7cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10605 11288 bytes

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