Malicious PDF — malware analysis report

Static analysis result for SHA-256 39a601a51366c2ae…

MALICIOUS

PDF

89.1 KB Created: 2021-03-21 01:09:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d7b6994827bd227c25ee7b05b7891b8c SHA-1: 9b646b35cc9a05b8bd1e28868a3d97235a840dfe SHA-256: 39a601a51366c2aea4752c894b1c5ff713dc53f5d955f8f4a6acfc049b4cdc92
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, contains text related to a 'hydrometeorological report', which is likely a lure. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with the ML_NYX_PDF_MALICIOUS and ClamAV detections, strongly indicate malicious intent. No scripts were extracted, but the overall structure points to a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/123?utm_term=hydrometeorological+report+no.+33 PDF link annotation
    • https://tagekoworiz.weebly.com/uploads/1/3/4/0/134016686/3477438.pdfIn PDF document text
    • https://gidunixodon.weebly.com/uploads/1/3/5/3/135322071/429d8.pdfIn PDF document text
    • https://luzenesezenobo.weebly.com/uploads/1/3/5/3/135307250/rixuvek-gatoz-xenose.pdfIn PDF document text
    • https://cdn.sqhk.co/tidilotofuka/ihehegd/71060777209.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/gciihgY/luzelak.pdfIn PDF document text
    • https://fibimijisu.weebly.com/uploads/1/3/4/4/134461798/maribumebal.pdfIn PDF document text
    • https://gitikaru.weebly.com/uploads/1/3/4/9/134901111/9a561e9aeac52e.pdfIn PDF document text
    • https://cdn.sqhk.co/lajakukilo/eDieheK/bingo_bash_8_free_chips_slots_freebies.pdfIn PDF document text
    • https://cdn.sqhk.co/livukigelo/W5Cjdjh/classroom_observation_notes_examples.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/14f0c0c9-dff0-4a64-b18c-ba01a4a91799/51281811563.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d5149df-fb3f-4f1a-bba6-3bdaeefa2bc0/31258533022.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/nosudotudavafagunapobebu.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezux/bazepiverodixujukibipug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53de3ba8-d424-41a7-9210-1918d792f14e/46549683009.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66163d56-a228-48d0-953c-0b92c0758864/dnd_5e_best_warlock_subclass.pdfIn PDF document text
    • https://793776f3-68b4-44d3-947a-596ce2c6f652.filesusr.com/ugd/4e977a_be8838fedb83408cb32cf33d1dc1a98d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/56f85a4c-5bb5-432a-8417-e0ee14b5466d/76160595602.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/schubert_serenade_guitar_sheet_music.pdfIn PDF document text
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_996e2d38fc8f4be5ae76ebdb51bbf841.pdf?index=trueIn PDF document text
    • https://b2f02272-107b-4032-aafc-54cdd6265a16.filesusr.com/ugd/6cf392_5d19e7cc65344ffda9ac6edac85cc52e.pdf?index=trueIn PDF document text
    • https://0f285ee0-1b14-49a2-8a3e-060a2db94812.filesusr.com/ugd/4bf67f_a3fa24209348416ea0e216fcf3e4b0ae.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1674975f-6dc0-4f9d-95d5-c74c34c685b9/pefeto.pdfIn PDF document text
    • https://da89e6ec-52f9-4c28-8de8-447a2e923c0c.filesusr.com/ugd/5e5b2a_4228a845ddfc4c87a8f90c49c089927c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sazixipame/broncos_injury_report_week_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/636084a1-761a-42f3-8b71-144fd9a2e169/kesawatalakaxi.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/danny_devito_song_sheet_music.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_off00011ef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF6 5472 bytes
SHA-256: 570c4873d06e6a12558114267a1adc3c669859419363b212ec3e39ed3dde8a8f
font_01_sfnt_off00013190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13190 10568 bytes
SHA-256: d26c569049e55765dbcb50864999e9396c5e27dc10e1eb47e95ae0f41f5558e0

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