Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6ffd0f4dca7d94d…

MALICIOUS

PDF

81.3 KB Created: 2021-04-17 05:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 94a7728fc9f05eebc1a4b56f7380810f SHA-1: aeac7823ce7354b96f69dfdd68d5ed98079dc401 SHA-256: a6ffd0f4dca7d94d25b11ab26c92267100a945f6970986bcfbb59ce1b8bd30dd
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, with several pointing to potentially malicious or disposable domains, suggesting it functions as a link farm or phishing lure. The document body, though heavily obfuscated, contains text related to a 'dirt devil spot scrubber', which is likely a pretext to drive traffic to the linked sites.

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=how+do+you+use+the+dirt+devil+spot+scrubber PDF link annotation
    • https://femoleperatofev.weebly.com/uploads/1/3/4/7/134752505/delusoxumewovemodawi.pdfIn PDF document text
    • http://legionmone.xyz/heron_tp_wingspang6keu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408718/normal_6011d41eb6ff5.pdfIn PDF document text
    • http://santand-es.com/ejercicios_de_caligrafia_para_segundo_grado_primariafa32j.pdfIn PDF document text
    • https://jupagefux.weebly.com/uploads/1/3/1/3/131398252/fusux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378160/normal_6054830230cca.pdfIn PDF document text
    • https://tigelulipuneve.weebly.com/uploads/1/3/4/7/134746657/texazijezi.pdfIn PDF document text
    • https://zupagefu.weebly.com/uploads/1/3/1/0/131070313/02665.pdfIn PDF document text
    • http://presentinsta.site/risupuwapufifufolokxp8y.pdfIn PDF document text
    • http://rivokalodusi.sportsontheweb.net/amazing_grace_sheet_music_f_major.pdfIn PDF document text
    • https://pazijovipa.weebly.com/uploads/1/3/4/3/134327002/045d6a8cc9cce.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcfcae48-0142-44f3-9d30-6d0ac7f2c669/95703342579.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/alpinestars_pants_sizing_guide.pdfIn PDF document text
    • http://kakasis.onlinewebshop.net/interview_form_template.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/politimoxiweb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cb5a8ca-74ba-466c-b86e-52087f7f1761/worululo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92506ffe-396c-4576-ba53-37e4c3ce0c21/bexibosawodetureror.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51a9bd9a-5844-4d00-9102-4d19718ff19b/what_does_mito_mean_in_spanish.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1b8b64d-4fc8-49f1-8757-f3ef2f4271b2/76970366313.pdfIn PDF document text
    • http://lojibovel.myartsonline.com/icao_aerodrome_design_manual_part_3.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001018c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018C 5304 bytes
SHA-256: 0e2a99905b5f65a2c0e951d149b357528b04e8e2fb17def2f83dcba48cb3714f
font_01_sfnt_off000113a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A5 10648 bytes
SHA-256: a71b44a21ab254af86630d32cc51199ff6d5691e8b3fbc814265a530b2b13921

Open this report in the interactive analyzer, or submit your own file for analysis.