Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c0837fd06e267c8…

MALICIOUS

PDF

74.3 KB Created: 2021-03-16 15:54:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ff0a3613d28e5aa80e505f2afc237f96 SHA-1: 9db28eff19e405eeb89d055a1a425e12bbceebec SHA-256: 6c0837fd06e267c8d172e7eb0d2b9bc723fc12bed6fcf509c2c6a25ce79e318e
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://xajibur.ru/strik?utm_term=john+deere+walk+behind+mower+wheels PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4444877/normal_5fdbf675c24be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369328/normal_602ef47e16e08.pdfIn PDF document text
    • http://reduslim-buy.site/bajirao_mastani_full_movie_english_subtitles_downloadzs8vy.pdfIn PDF document text
    • http://glawerry.online/shop_class_as_soulcraft_goodreadsavhtb.pdfIn PDF document text
    • http://getcreditcheck.info/kiffe_kiffe_demain_by_faza_gunesfdmw.pdfIn PDF document text
    • http://italdom.fun/sherwood_rx_4109dqgtg.pdfIn PDF document text
    • http://nout-prokat.website/13671348004rdxek.pdfIn PDF document text
    • http://texno3ua.com/bmw_x3_f25_service_manualqxkbw.pdfIn PDF document text
    • http://vinorama.fun/difference_between_austempering_and_martemperingtax0j.pdfIn PDF document text
    • http://businessmentality.com/18443352232iq4w.pdfIn PDF document text
    • http://shimano-stradic.ru/24705213341oemjq.pdfIn PDF document text
    • http://idealslim-italiaoficial.site/33761423697n4hhb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_d26ea6fd967a4014b8b3934d5e4e2660.pdf?index=trueIn PDF document text
    • https://234d5d8d-19c9-4cab-a884-dd0775662658.filesusr.com/ugd/fb7225_9a953af2000b4b5bb704c470625c5110.pdf?index=trueIn PDF document text
    • https://2a403a33-5f6e-4534-96f9-742aa7325afc.filesusr.com/ugd/d2da83_6354d5c1548944a4bb40888ba0e20e3d.pdf?index=trueIn PDF document text
    • https://2ac8321c-28d8-41c8-ac7a-99137a6fe030.filesusr.com/ugd/157ee0_86d784f8269b4e748aaef8f7557d710a.pdf?index=trueIn PDF document text
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_94d5a93cc2e9434da52dc98784e95a60.pdf?index=trueIn PDF document text
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_f2ee92d9b71d4be29354eaf5e7582fa3.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E6 5056 bytes
SHA-256: 62e8ccba795cd2a291afcc274587028b7c7ac8b815ea3048d33ac96df4b3426b
font_01_sfnt_off0000e7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E3 11140 bytes
SHA-256: 23b514aba2b98c05836edba206908b51e82b926e91906d2db8c72495cfaa8407
font_02_sfnt_off00010dcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCF 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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