Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ba391526343c3d5…

MALICIOUS

PDF

77.5 KB Created: 2021-05-02 03:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 8a1afc44b49923df1605ae73ea3eecdb SHA-1: 718d0f5bf5b84359dd8aa164389af4a532c4264e SHA-256: 3ba391526343c3d570679c5d9ddf2747f7873592137e0e60463933b24090ecdd
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' indicating a large number of outbound links. The primary malicious URL identified is 'https://bologen.ru/strik?utm_term=midpoint+and+distance+formula+worksheets+pdf', which is likely used for phishing or to serve a secondary payload. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://bologen.ru/strik?utm_term=midpoint+and+distance+formula+worksheets+pdf PDF link annotation
    • http://lavorunolutoga.22web.org/hannah_crafts_the_bondwoman_s_narrative.pdfIn PDF document text
    • https://cdn.sqhk.co/riwaxagi/ijjijiM/jedosujixokodogezo.pdfIn PDF document text
    • https://cdn.sqhk.co/gafisasiwu/Fhbmsgi/flight_status_maputo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dafesofuxub.rf.gd/anaganaga_song_from_aravinda_sametha_free.pdfIn PDF document text
    • https://f499a9ea-5579-4d3c-a180-ba191067f9b7.filesusr.com/ugd/34ec99_24ba36f14da143928524cd06c8094b29.pdf?index=trueIn PDF document text
    • http://silapopo.epizy.com/70125441536.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/photoshop_learning_step_by_step.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/99483868656.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/xezomifojukeset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd5202b7-4426-4edc-8614-54eda706461e/xbox_one_controller_charging_dock.pdfIn PDF document text
    • https://29ca30ec-7ad4-487f-8637-d2d67f3a323c.filesusr.com/ugd/10b11f_5e345fa9ca854ff99ee33814fe8dbb34.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/libosokune/51343013177.pdfIn PDF document text
    • https://30dce114-5b7d-4ba4-aa44-e083516804ec.filesusr.com/ugd/7de0fd_ebb406c71949449eacfe2ebda326dbb9.pdf?index=trueIn PDF document text
    • https://54d25d35-1219-4e5f-97c3-905e72ea606f.filesusr.com/ugd/6d59ab_837f18a46862425580ef3f0e8b5b05be.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9a8d688-772e-4003-bffc-0203e14a718c/balojenewuma.pdfIn PDF document text
    • http://raxusitusumulag.rf.gd/61739086945.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/who_are_reys_parents_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/kung_fu_tea_media_instagram.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/in_deuterostomes_the_forms_from_the_blastopore.pdfIn 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_off0000ef12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF12 5556 bytes
SHA-256: 3ef2140cc6dce06c6d17452cbd5aff78bcd741224ec74604effba89e6ac7c0d2
font_01_sfnt_off000101ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EE 11224 bytes
SHA-256: 277b6e573aa7d0c9710da6cc28f6360f7c1b95b3f3c452f63041b8373e736d33

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