Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbafe33956d1f6b1…

MALICIOUS

PDF

125.4 KB Created: 2021-05-20 09:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9a2ec471b0415adafddb4c64fb8fa842 SHA-1: f1bd6e2dce610e3c5132765470acfa22ec2fc87b SHA-256: bbafe33956d1f6b182c665fa3c20f1cf494638b8dcc1ab51ee2a9eb7fa1754d8
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to appear as legitimate content. The primary malicious URL identified is 'https://ponafet.ru/strik?utm_term=el+manual+del+futuro+millonario+pdf', which is likely used for phishing or to serve a malicious payload. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a large number of outbound links, suggesting an attempt to manipulate search results or distribute content across multiple domains. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ponafet.ru/strik?utm_term=el+manual+del+futuro+millonario+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369138/normal_604b0f4a4fdaa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448980/normal_5ff8d831b2fba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474470/normal_60361f7162bad.pdfIn PDF document text
    • https://supagerafigi.weebly.com/uploads/1/3/0/8/130874211/3033614.pdfIn PDF document text
    • https://fugazuxelodurip.weebly.com/uploads/1/3/4/6/134639195/6165907.pdfIn PDF document text
    • https://nulupuro.weebly.com/uploads/1/3/4/5/134596779/2024697.pdfIn PDF document text
    • https://munuteme.weebly.com/uploads/1/3/4/8/134862418/2324427.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500183/normal_5fdd6955d3dc0.pdfIn PDF document text
    • https://dipakinujudisil.weebly.com/uploads/1/3/4/4/134468351/3128293.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/woxotopapozokev/how_to_update_neopost_franking_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d8facd7-cdfb-44f9-99ed-0c8c8eb18886/how_to_raise_successful_child.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bed625c-ac29-4e8e-975c-941480965119/gutilug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/190089c2-bfad-4468-b1c6-6dd96510fcfc/z97_pc_mate_compatible_cpu.pdfIn PDF document text
    • https://s3.amazonaws.com/bogeguva/how_to_report_effect_size_cohens_d.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/311c85c8-cd32-4e09-b758-cd6993567092/probability_practice_problems_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5163e51b-6e4b-498f-879c-9b0aa7ef6c05/amp_triplex_9200_rst.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/sivapurusuxo.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/tesadamatekowevo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f943747-815c-4527-8c1d-34804fb78655/16586761582.pdfIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/kavipetitor.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/zuwupe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da50e7a7-ac23-4ac1-84dd-b244ef3e9863/zuzenemelolodita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a605bc1-8eb1-43b3-a9b9-6cdbb91597bd/vans_old_skool_black_womens_7.5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62aac801-c3de-4fb8-b30c-2e99382a2e4e/fixuxenij.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_off0001ac48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC48 4964 bytes
SHA-256: 70bfcbbf15daa003db8df54de704a8e63e4eaf55aa2619f045ffdfa34c4c0f58
font_01_sfnt_off0001bd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD18 12856 bytes
SHA-256: 8ac15263b6b393ef6491249c133caa0450d3dd99fe267086b77996920bc6edc2

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