Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b3557e438d7a106…

MALICIOUS

PDF

84.5 KB Created: 2021-03-19 07:03:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 102b920f9a144b3232c583c6fe8dea4b SHA-1: 319d5d070bf41cbbe66e13c7e74a2a6f3775f5f3 SHA-256: 0b3557e438d7a1064b1605ed927c51e3e2a579417726cbd70ef687b24ed2c59b
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://crophysi.ru/123?utm_term=bahubali+songs++12 PDF link annotation
    • https://kakituku.weebly.com/uploads/1/3/4/5/134589995/xolenurokefuwiputave.pdfIn PDF document text
    • http://leverava.iblogger.org/microsoft_office_2010_outlook_indexing_not_working.pdfIn PDF document text
    • http://fetisaletom.iblogger.org/71042388828.pdfIn PDF document text
    • http://pazifelurup.medianewsonline.com/bonefish_brunch_menu.pdfIn PDF document text
    • http://wijutomotagam.mypressonline.com/3ds_max_character_animation_tutorial.pdfIn PDF document text
    • https://nekemobo.weebly.com/uploads/1/3/5/3/135323096/ruzolumisiribaw-zikozesilageva-kodotefifeje.pdfIn PDF document text
    • https://vataripisak.weebly.com/uploads/1/3/4/6/134600115/149d3ec0c.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
    • http://bizurano.epizy.com/bioaccumulation_worksheet.pdfIn PDF document text
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_3522b61439164fe2ba864be111b7b9f3.pdf?index=trueIn PDF document text
    • http://gafijid.atwebpages.com/advertising_media_strategy.pdfIn PDF document text
    • https://1d812fcc-cfc3-4558-a870-56fc5b7f4c2e.filesusr.com/ugd/754d94_650e56c19e3e4787a904488a13d9944e.pdf?index=trueIn PDF document text
    • http://gakilasefit.myartsonline.com/john_deere_lawn_tractor_service_near_me.pdfIn PDF document text
    • https://4eb83289-b313-4542-b68c-79a1d4783db4.filesusr.com/ugd/f6336d_2e0b585436e84777b68569a8dad4d5e9.pdf?index=trueIn PDF document text
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_e97b8e43aede4f478ebeba8facbed819.pdf?index=trueIn PDF document text
    • http://lamupilabixekuw.epizy.com/baseball_field_images.pdfIn PDF document text
    • https://aed022ca-8a9d-452d-9022-56a74a585a14.filesusr.com/ugd/4d548e_9f2735afe24a42a68ea0e50b01dfcdfe.pdf?index=trueIn PDF document text
    • http://fuxewon.epizy.com/go_for_no_audiobook.pdfIn PDF document text
    • http://xovabegu.epizy.com/xigatibedineriz.pdfIn PDF document text
    • https://91953a53-6f32-4f2a-9b2e-0f954541ff31.filesusr.com/ugd/dad90e_49a7d573cf7741648f56ec0a4e2099d3.pdf?index=trueIn PDF document text
    • https://74f55dc1-c9a5-4be3-8cb6-5a41d2e6c5ca.filesusr.com/ugd/bacb18_fe12ac6cc1df4f29b0b3c5a63aafd1da.pdf?index=trueIn PDF document text
    • http://kojuvurapamox.myartsonline.com/how_to_write_citations_in_apa.pdfIn PDF document text
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_a458fa5c28de4f0c81767b7b205a4497.pdf?index=trueIn 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_off0000fe8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8F 4908 bytes
SHA-256: ce1dafa54c844ec2daef098964a7deeca090606b90df587eec9a55955d0a38ef
font_01_sfnt_off00010f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2D 11852 bytes
SHA-256: 40abecbadd30bc1f1e546dd6c1c023c432535ceb4e5a16b8800e56337a5aff17
font_02_sfnt_off0001370b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1370B 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3