Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ca9e9f052b2688…

MALICIOUS

PDF

92.9 KB Created: 2021-03-21 08:27:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: fc8d79392972e07de0fae0aaa7eab4fb SHA-1: aa0addbc7003cc5a5b6c9f9601c19f9771a19541 SHA-256: 21ca9e9f052b2688407f86977d0b0424993f5884f6b5c32bc5576ecec07b294d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://golowaki.ru/strik?utm_term=what+are+the+features+of+suprasegmental+phonology PDF link annotation
    • https://cdn.sqhk.co/logubaxe/jiGurgi/20522922493.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402294/normal_604db8d544c49.pdfIn PDF document text
    • https://cdn.sqhk.co/nezerozara/gghfYhc/easy_pay_login.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407066/normal_60494b9023eb0.pdfIn PDF document text
    • https://cdn.sqhk.co/wujozuzewed/heickhb/40448079477.pdfIn PDF document text
    • https://cdn.sqhk.co/dowusutitozi/jeBONl5/bird_feeder_plans_for_cardinals.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476582/normal_601de687ea51e.pdfIn PDF document text
    • https://cdn.sqhk.co/navififoro/EtLBjen/my_lg_android_won_t_turn_on.pdfIn PDF document text
    • https://cdn.sqhk.co/wazilisiko/heibefZ/running_lion_gif_animated.pdfIn PDF document text
    • https://cdn.sqhk.co/mewedenemez/jdhchkz/3429961207.pdfIn PDF document text
    • https://cdn.sqhk.co/fomeluxilim/CZgdibD/tunnel_hull_race_boat_for_sale.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/075f5c2f-146a-4003-bc0b-71a739887a4f/canon_p170-dh_paper_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e35e4aec-2b20-4158-b9e5-f8ce2eb5ff76/mirolumenuzipofisadu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b714caa-ed97-412b-907f-d60ccc044469/81093518079.pdfIn PDF document text
    • https://ff87c8b5-ca28-4ac0-94ba-218234037d87.filesusr.com/ugd/1d4e4f_ea54babf267648ac9dcd3d892bcde5aa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/46e15203-4952-49b2-87e9-cda65c7f2fe0/lithium_carbonate_davis.pdfIn PDF document text
    • https://edefa294-c65c-46c5-840b-8a4669b9fdfe.filesusr.com/ugd/e4a001_83863438af66421a9c8e638c8080e7a0.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_off00012618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12618 5432 bytes
SHA-256: 7b192deab981cecde6cbd98f329aa3b03b0c0bfd73425790939b144e1370fc4e
font_01_sfnt_off00013880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13880 15472 bytes
SHA-256: 33e9714d4cb5eb28f8ab8882bbb7f14d43a6fb06c7650a9527d87aba4fa6a62f

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