Malicious PDF — malware analysis report

Static analysis result for SHA-256 77364e7ee78a6ff2…

MALICIOUS

PDF

115.6 KB Created: 2021-03-31 12:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 321ff8b6aee347e060f0bebc8710a951 SHA-1: 62d9913be3fef7e8e7162a30816321ad6849ab56 SHA-256: 77364e7ee78a6ff28fea763fc8c1f77e701842d1fc91a1ea2a69e8a75a4890fc
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to benign-looking documents but one points to a suspicious domain (kuzutuzo.ru). The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a link farm or SEO spam tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/strik?utm_term=how+to+find+your+workkeys+score PDF link annotation
    • http://rkconstructionsucks.com/nike_run_club_apple_watch_app_not_workingdx95j.pdfIn PDF document text
    • https://jowatewiko.weebly.com/uploads/1/3/1/3/131380225/129491b62df.pdfIn PDF document text
    • https://gekigojux.weebly.com/uploads/1/3/4/3/134339050/sofixitovo.pdfIn PDF document text
    • https://towoxaji.weebly.com/uploads/1/3/0/7/130740158/4088606.pdfIn PDF document text
    • http://kungfumalibu.com/97848066447sgbvr.pdfIn PDF document text
    • https://bavejojonosepes.weebly.com/uploads/1/3/1/3/131380601/77680.pdfIn PDF document text
    • https://dowusasetitemej.weebly.com/uploads/1/3/4/3/134307927/famexiweg-jafefedep.pdfIn PDF document text
    • https://xarupome.weebly.com/uploads/1/3/4/4/134469096/kuras-buboxibaxudova.pdfIn PDF document text
    • https://xapewagese.weebly.com/uploads/1/3/4/3/134314981/a6ebdf9bfb7.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://s3.amazonaws.com/paropabaru/format_of_formal_letter_subject.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/the_scarlet_pimpernel_by_baroness_orczy.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/24011986615.pdfIn PDF document text
    • http://rixaxapuroveto.rf.gd/zudoripazu.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/lazutedajilejudomeliped.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d9f47ba-0ec6-4533-b4d3-a3e7efcbc962/joe_defranco_training_economy.pdfIn PDF document text
    • http://sutobeniwemezet.rf.gd/i_dreamed_a_dream_piano_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/zolozovetikeremewimedaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37a5a05a-55f6-4b90-a2a4-19ee7fc3a5ea/71513341295.pdfIn PDF document text
    • http://wexejof.epizy.com/52516431482.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BF5 4872 bytes
SHA-256: d70a0987d19fd91cc049c9f75d234414de7f5efcb4555a4f21f095e2091876d8
font_01_sfnt_off00018cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CB0 11036 bytes
SHA-256: 6b59088a2aa6d98e6317afbfa7babb0f659c2d358d49885038922d8b9fed464c
font_02_sfnt_off0001b21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B21C 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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