Malicious PDF — malware analysis report

Static analysis result for SHA-256 4734c8d6dcdbca24…

MALICIOUS

PDF

66.5 KB Created: 2021-03-26 06:40:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c33e857efc50a76a11b9828c41b268ba SHA-1: 1f258c0ed5f1167f608bea0fb1ece0f00e675e64 SHA-256: 4734c8d6dcdbca24249844062f845414177a662a28a2d91758bf4fab03f2255e
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 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/123?utm_term=churake+dil+mera+ringtone+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368975/normal_6055841204934.pdfIn PDF document text
    • https://cdn.sqhk.co/duwefetufe/rxL3Fge/into_the_dead_2_ending_explained.pdfIn PDF document text
    • http://ribadubeko.scienceontheweb.net/types_of_nouns_in_english_grammar_with_examples.pdfIn PDF document text
    • https://cdn.sqhk.co/mibuguxinise/hau2hjN/bumidolazufafidedasome.pdfIn PDF document text
    • http://alternativeinfluencenetwork.net/71357336661k9s8y.pdfIn PDF document text
    • http://zusiwibewire.mypressonline.com/automatic_door_lock_system_project_using_arduino.pdfIn PDF document text
    • https://cdn.sqhk.co/batumozi/dxeheia/butajixad.pdfIn PDF document text
    • http://opensalle.xyz/why_does_my_pressure_washer_leak_oild4b7r.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417226/normal_5fc7d57034cd3.pdfIn PDF document text
    • https://cdn.sqhk.co/wazikunal/ja61nih/mud_bogging_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/sipobufiw/Y5Khdif/suvodasumorerudaxolep.pdfIn PDF document text
    • http://rakadan.sportsontheweb.net/amino_acids_and_proteins.pdfIn PDF document text
    • https://cdn.sqhk.co/fiseguvugele/gfibgc2/futibuzigegoxut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447433/normal_5fece60b2ff70.pdfIn PDF document text
    • http://meetcabinets.xyz/88565765805bljd0.pdfIn PDF document text
    • http://spindlndou.space/love_story_bengali_movie_release_dateh5yq3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vugugemo.atwebpages.com/63602542559.pdfIn PDF document text
    • http://wovodijulenape.onlinewebshop.net/47440591065.pdfIn PDF document text
    • https://1bc2da55-d9f9-46f5-9d67-b48dc82c85d4.filesusr.com/ugd/957ce7_ecd7be1f266b4c27bee93410ca424b5b.pdf?index=trueIn PDF document text
    • https://631ffb88-cf2d-4844-8d6b-9338a1b21cc5.filesusr.com/ugd/d24e6f_a4f6cb218fc94f4b975c345b59746992.pdf?index=trueIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_e0c157d5677744a1a7b100fb8fb65c7f.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_off0000c810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC810 5112 bytes
SHA-256: e9a96b1889d7a99d8556ae2b16c4a1c6d6e00fa29dbfab2e48a9fcbf53337eca
font_01_sfnt_off0000d949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD949 10392 bytes
SHA-256: f6de544c2c98e77e81dbc4e04ce17aacaf468a0777c965962700c24b70e1e64c

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