Malicious PDF — malware analysis report

Static analysis result for SHA-256 c07484755c7f0a96…

MALICIOUS

PDF

102.9 KB Created: 2021-05-16 10:32:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 1372fc612927233324217cdfd8a84f7a SHA-1: 2a53bc16015bd7dba4244a4de3044ac109ab499d SHA-256: c07484755c7f0a968c044f4005f26d3a3f8d6886d51853c8dde0f3f0e8bdd7af
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one prominent URL pointing to 'baarspo.ru', suggesting a phishing or malware distribution lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious nature by identifying the PDF as a link farm on disposable hosting, likely to obscure the true destination.

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
  • 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://baarspo.ru/strik?utm_term=tanya+the+evil+art+book PDF link annotation
    • http://tifubuza.22web.org/35673593970.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471240/normal_5fec2b7737876.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393183/normal_600d6d101e072.pdfIn PDF document text
    • https://movobukibajub.weebly.com/uploads/1/3/4/5/134597216/wajavixubuse.pdfIn PDF document text
    • http://nepajos.iblogger.org/mufufedaxinemapafizosak.pdfIn PDF document text
    • http://mivolamuzimapu.22web.org/4667522373.pdfIn PDF document text
    • https://boxenujevodaziw.weebly.com/uploads/1/3/1/0/131070305/101f18bd53.pdfIn PDF document text
    • https://pefoduzipim.weebly.com/uploads/1/3/4/3/134371740/58be49b7c731b.pdfIn PDF document text
    • https://vedexojofidas.weebly.com/uploads/1/3/4/5/134581268/musenatavikif_vodutapuvobige.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://muxuvakuxu.rf.gd/65069173109.pdfIn PDF document text
    • https://03df74f7-894d-4c84-999e-da2b33eb06f5.filesusr.com/ugd/4c7733_ad7f57b75b3b44f3849c108aabc138a3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/attack_on_titan_manga_volume_23_download.pdfIn PDF document text
    • http://misofex.epizy.com/tonuvugovikiguz.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/amazon_music_app_for_windows_7.pdfIn PDF document text
    • https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_a1570cab6afe4c28bbcaada0785bbc6f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/pugagu.pdfIn PDF document text
    • http://kefawifilibuvo.rf.gd/91494381589.pdfIn PDF document text
    • https://ad323f3e-245e-4e3c-8b16-de91fefec063.filesusr.com/ugd/5ea691_9ae308edc75e42d296252c1865709191.pdf?index=trueIn PDF document text
    • http://puwapogajamafar.epizy.com/dibrugarh_university_msc_mathematics_syllabus.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_off00010aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEE 23260 bytes
SHA-256: 39aea0143127815efb5c37f802c2881dc2212ab8a1f6b80084c79eb3e7d1e180
font_01_sfnt_off0001553c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1553C 4912 bytes
SHA-256: 43e88151d05d9f4ae5a00a7640d61f5d4eb20aae2e1f5dfb816785f5898fe9e8
font_02_sfnt_off000165f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165F7 12476 bytes
SHA-256: f716b796e91d0807bade149346eb66e7f7a21a4439bb6bca88da9b79a269084a

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