Malicious PDF — malware analysis report

Static analysis result for SHA-256 781272c04f99c6f6…

MALICIOUS

PDF

74.3 KB Created: 2021-03-20 18:54:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ad07f394b2b2e3e69b2baa7757dcfc8b SHA-1: c81b5831a5633d7dffb1c972ee6468729a0782ff SHA-256: 781272c04f99c6f6050532c2d21b155c39bdd24a6758527f4ddc826a2fad17fe
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of external links, many of which are SEO-optimized and redirect to other URLs. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, and 'PDF_SEO_UTM_REDIRECTOR_LINK' points to an image lure linking to an SEO redirector. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or SEO spam distribution mechanism.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://leonvi.ru/wix?keyword=trigonometry+review+pdf PDF link annotation
    • https://cdn.sqhk.co/jeforije/jigHghW/divar_shiraz_mobile.pdfIn PDF document text
    • https://cdn.sqhk.co/livulopo/Kgijbjc/star_trek_fleet_command_wiki_dilithium_mine_locations.pdfIn PDF document text
    • https://cdn.sqhk.co/marixefe/Wjmjcia/75363606676.pdfIn PDF document text
    • https://cdn.sqhk.co/xenumobavun/Ihheigq/toxanirodepeguzebow.pdfIn PDF document text
    • https://cdn.sqhk.co/digiwejasipu/dn4gdhW/30157466499.pdfIn PDF document text
    • https://cdn.sqhk.co/dikonutudibe/jcgewmV/chatuchak_guide_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/dabeluza/jjudwtM/beard_trimmers_for_men.pdfIn PDF document text
    • https://cdn.sqhk.co/ranetixeba/hcgimg2/games_like_age_of_war_ios.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471235/normal_603c3d11702a0.pdfIn PDF document text
    • https://cdn.sqhk.co/fakodozug/iidyVZN/zurazizatawumisufokonid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476601/normal_6034835e5ef98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421215/normal_60298aad7e3de.pdfIn PDF document text
    • https://cdn.sqhk.co/zikufivol/d7qV4LW/37189760967.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_b3c679477b0543e59a40e17edbe80a43.pdf?index=trueIn PDF document text
    • https://7043ee2c-bc2d-4d46-b82c-b0075177c1aa.filesusr.com/ugd/f862b5_ec85a8ae6d53475694bb356cca06b3ef.pdf?index=trueIn PDF document text
    • https://28932ed2-21d9-4123-99cb-fcff0aac4472.filesusr.com/ugd/cc089a_134a9a8838114107b674754677542372.pdf?index=trueIn PDF document text
    • https://50b44c92-959e-4a15-bf83-93d6b2b518d6.filesusr.com/ugd/3ed44c_447df02d73cd4739817920fd8bda4a9e.pdf?index=trueIn PDF document text
    • https://cc67bef4-e22e-42fd-bf01-3f02b15f800b.filesusr.com/ugd/080020_87cc106692dc4362899012b6ff02ef77.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_off0000e451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE451 5144 bytes
SHA-256: 3afe743f11aad64f645ee8cdd48e05a18a2b56c1130cb09683558b35b39e9b0e
font_01_sfnt_off0000f5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E1 11260 bytes
SHA-256: 2752b970ffcb230b5ecad5d2bd05ce98006f3fad9ad316d3a726949f37969542

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