Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf955f5f63bcbea4…

MALICIOUS

PDF

76.8 KB Created: 2021-04-21 17:19:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 19622a118a84c7921597c92bcb21534e SHA-1: b1173dcb03169913b701b4ecb444da83c1cc29f8 SHA-256: cf955f5f63bcbea4b94a15642e15053f4d15d182900bca84ce7539618dbcff9d
186 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 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://fokemale.ru/strik?utm_term=where+can+i+take+my+sewing+machine+for+repair PDF link annotation
    • http://testrun.ru/bose_quietcomfort_15_replacement_ear_padsjrvfp.pdfIn PDF document text
    • http://latencfsrt.space/vupewogojepunipeginazose2wgd7.pdfIn PDF document text
    • http://zijixiteluwek.scienceontheweb.net/approximation_algorithms_book.pdfIn PDF document text
    • http://blancer.xyz/683749231783cl4s.pdfIn PDF document text
    • http://zutelotojenexop.getenjoyment.net/detect_text_in_image.pdfIn PDF document text
    • https://muvozipiga.weebly.com/uploads/1/3/5/3/135391344/9295be635.pdfIn PDF document text
    • http://paktum.pro/86725270616h1x4o.pdfIn PDF document text
    • https://dadekubezaxinis.weebly.com/uploads/1/3/2/7/132740399/9e011c.pdfIn PDF document text
    • http://freehookup.xyz/wiwowulopamafakunuvejlq7.pdfIn PDF document text
    • http://mixezitubut.mygamesonline.org/51846777410.pdfIn PDF document text
    • http://pararapameso.getenjoyment.net/active_and_passive_voice_exercises_for_ssc.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/650a1098-9017-4698-b31a-213ff8094cfa/mimuzekumoze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4472cf9b-e276-4a0a-a202-f88a8f603e16/coleman_portable_gas_grill_replacement_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7eaede73-b899-4ff2-bddb-dd2a6cd25c98/zobevadavomuve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d29c9ca-47c6-42bc-933d-38b24ab442b2/giwabinix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e178cb53-1235-4edb-9562-42f6d50449d8/what_does_a_car_seat_expiration_date_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49c22d2e-94f1-4ff8-a833-a7b8dee02663/sig_sauer_p238_9mm_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1966a040-b455-4b02-84e6-fd51e60bcd74/waffle_house_job_application.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3fd1857-265e-47f0-a0b6-4246443135a4/dalofumezavuzimeki.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_off0000edfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFB 5668 bytes
SHA-256: b7e114167140fc942abe0bc11436d0dc08d636dd5d67118abd9ca6e7422a049e
font_01_sfnt_off00010145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10145 10084 bytes
SHA-256: 36c43425de5b98f7e79da44df79c9ed52b6cc7118c1664394abca21c44c92a38

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