Malicious PDF — malware analysis report

Static analysis result for SHA-256 daf53dfabbfc4e15…

MALICIOUS

PDF

74.4 KB Created: 2021-04-05 02:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1dc6ea4be99aafccd91abc334721fbc4 SHA-1: 3f7f9d661961d7f39c6a452942407eb2018656af SHA-256: daf53dfabbfc4e158aaa8aa0343438e0852fde67a3b88e610587b528163e8191
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links to external PDF files, a technique often used for SEO manipulation or to host phishing content. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a link to 'https://yafferge.ru/award?keyword=abortus+insipiens+pdf', indicating malicious redirector infrastructure. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=abortus+insipiens+pdf In PDF document text
    • https://cdn.sqhk.co/rebamomidaw/xgcVKgc/new_messenger_2020_logo.pdfIn PDF document text
    • https://cdn.sqhk.co/vilomikov/gcnDgiG/32923847395.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457839/normal_5fd6a83f6adb7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417995/normal_60053c5d1c67e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392463/normal_5fee8e9f7db8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393181/normal_60566ced6aae4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374838/normal_6024f1b813770.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500678/normal_603cacf7e5f5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385010/normal_601fdf9c86279.pdfIn PDF document text
    • https://cdn.sqhk.co/pewonogip/fdV4jjw/worowaxodisurewozoja.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447095/normal_60002d7f76a15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388422/normal_600f59ea3c1b4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bodajaku/bissell_cleanview_swivel_rewind_pet_upright_vacuum_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/dune_board_game_tournament_rules.pdfIn PDF document text
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_b2e8a48a3a9947c3b1c62cb408f6942b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/56490849412.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/37758348596.pdfIn PDF document text
    • https://7f06b679-e14d-4525-8955-d56a7cf6f710.filesusr.com/ugd/79e5df_95090e46931549219247e80fbd84adb9.pdf?index=trueIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_d01ea01b4c5e4a83811cf843f7194be4.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_off0000e917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE917 4924 bytes
SHA-256: ee5f37fe909501b468c37cdb952de7f4eb2d2a9ad0c4dedd50130d052113268a
font_01_sfnt_off0000f9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E3 10180 bytes
SHA-256: 18051543d18301441628dccea3beccc660832850dfb89e38990d8d3c8fd4ad7f

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