Malicious PDF — malware analysis report

Static analysis result for SHA-256 7deeb51f45015c47…

MALICIOUS

PDF

81.2 KB Created: 2021-04-16 06:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: b2c33df609b84472ae1244b63606d17f SHA-1: ef95ba1af16459bccbdf8be608ef8dbbb997d3e4 SHA-256: 7deeb51f45015c476a7795cdd6e9819b77f09242d4d48ea4a4a702df7938d0da
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jacksth.ru/strik?utm_term=baby+bjorn+one+carrier+minimum+weight PDF link annotation
    • https://bivawufixusu.weebly.com/uploads/1/3/1/4/131453301/4856924.pdfIn PDF document text
    • http://promooffer.site/32802439910ubks4.pdfIn PDF document text
    • https://jeximikukadolo.weebly.com/uploads/1/3/1/6/131636734/96c1e6503fd1.pdfIn PDF document text
    • https://cdn.sqhk.co/pimupigedu/jiGjiiw/solupunaxunugibitu.pdfIn PDF document text
    • https://cdn.sqhk.co/laruxibut/mzRHLhg/72552558186.pdfIn PDF document text
    • https://cdn.sqhk.co/zatejurix/iWggiaa/zudolivufuxumijene.pdfIn PDF document text
    • https://zagefejov.weebly.com/uploads/1/3/2/7/132710748/ladin.pdfIn PDF document text
    • https://sobexezawatu.weebly.com/uploads/1/3/4/9/134903145/dovaxefur.pdfIn PDF document text
    • https://wojanoxunoliwam.weebly.com/uploads/1/3/5/3/135394081/7d20b.pdfIn PDF document text
    • http://bcpzonasegur4viabcp.com/roland_midi_to_usb_converter10cc6.pdfIn PDF document text
    • https://cdn.sqhk.co/petawelesup/ihhOmad/free_photo_transfer_software_for_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/jofijoju/Jiidw2x/xulajiraginedikiwalozi.pdfIn PDF document text
    • https://dulawatekonirul.weebly.com/uploads/1/3/4/5/134589918/vekofi.pdfIn PDF document text
    • https://gagejewepaji.weebly.com/uploads/1/3/4/4/134444149/4987d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/c5d7cb9a-93a3-4893-81b9-828aa7bc4740/niwofizewar.pdfIn PDF document text
    • https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_19aeb6358f6b4d19b796b33523402cd0.pdf?index=trueIn PDF document text
    • https://44f39d5c-a655-4437-91b6-62b11e148e71.filesusr.com/ugd/eb4c03_f9737ca9a44142b0aa44414c7227e6f5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/86ffaa5d-2f0d-4c9d-895c-be1145129028/best_parkour_videos_in_the_world.pdfIn PDF document text
    • https://95e354e6-8561-4e52-807b-deb85f3b5fdd.filesusr.com/ugd/ca9b0a_3a25e9bf4b0a46379971bea3f5c70231.pdf?index=trueIn PDF document text
    • https://0879403c-3be5-48e4-925f-21334a7d5cfe.filesusr.com/ugd/407fcc_af202c7f5d624bdbbb6a6ea1ee63caf0.pdf?index=trueIn PDF document text
    • https://3a7b682b-4b85-4b21-836a-a34929c8735b.filesusr.com/ugd/0cd3a8_4f54495dfb5a4f8d8f9af6630e519b92.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba96ccb8-f50f-4aff-ba95-6ff935d2bc38/puzuzofanonozireduj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/177861fe-77ef-483f-90b9-b96e6e90b9c2/can_i_use_any_oil_for_my_chainsaw_chain.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_off0000f0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DD 5344 bytes
SHA-256: 7b0cb23de5b6f78c3d8b4b50456e5628a44a4a1256ecdb6ea640f859c409ab35
font_01_sfnt_off000102fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FA 11376 bytes
SHA-256: 7db0290793f32865401aef876e15306079dc059249d5463259adf3d9fd78d489
font_02_sfnt_off000128d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D8 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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