Malicious PDF — malware analysis report

Static analysis result for SHA-256 c07a8edf0c4a64ce…

MALICIOUS

PDF

82.4 KB Created: 2021-04-08 09:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 167ede3410147b023803f98d1f902663 SHA-1: 52483b5622cdb232ce87f83eefb9054e26de34f7 SHA-256: c07a8edf0c4a64cecaae5afe07d1368904162ecdb246116a85e006ebb12c6679
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/123?utm_term=ekg+reading+crossword+answer PDF link annotation
    • https://tuvuneboginat.weebly.com/uploads/1/3/1/6/131606819/1f2a6.pdfIn PDF document text
    • https://xuwosanilenerev.weebly.com/uploads/1/3/4/9/134900173/d1ece8.pdfIn PDF document text
    • https://zurukuwimuso.weebly.com/uploads/1/3/4/3/134325804/xiwitifel.pdfIn PDF document text
    • https://rebopugosoge.weebly.com/uploads/1/3/5/3/135346619/xebin.pdfIn PDF document text
    • https://fonutupo.weebly.com/uploads/1/3/4/7/134727000/kowowesunamox-miwixavamoz.pdfIn PDF document text
    • http://bepufuz.22web.org/meade_lx200_emc_review.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://db532842-334f-4efb-8993-e67ec8f20ff5.filesusr.com/ugd/bc5be3_a7ed30e4564645128525c5c478dc7b04.pdf?index=trueIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_659f9cffe2a246e7b98ef18559c91c7c.pdf?index=trueIn PDF document text
    • https://1482387f-61d8-47e1-b538-9b7f1e8b89fb.filesusr.com/ugd/538d67_05c9ce523aec4199b4f2c4189d8b6e32.pdf?index=trueIn PDF document text
    • http://texakotinize.rf.gd/how_to_use_apple_pencil_to_annotate.pdfIn PDF document text
    • https://7fca5364-97a1-4441-b76e-d2c429a59218.filesusr.com/ugd/735424_06305d9a48de4f2a8e166334b08bd597.pdf?index=trueIn PDF document text
    • https://dd907c4b-492b-4b4d-bf3c-9f0b7a2bd2c7.filesusr.com/ugd/96a426_f92f6c4b6749470a819022227bd006b9.pdf?index=trueIn PDF document text
    • http://wirizobesopo.epizy.com/gorexes.pdfIn PDF document text
    • https://34e2f0dc-0077-42bd-a047-efa2502e92af.filesusr.com/ugd/8a05ec_330ba80fec5a4a7695e14fbaa3722b8a.pdf?index=trueIn PDF document text
    • https://e924225a-aa46-4bfc-8e56-7341551e1833.filesusr.com/ugd/54dfea_f1547362ead54bca9241eabbfc92ceea.pdf?index=trueIn PDF document text
    • http://dabifav.epizy.com/how_to_deep_clean_a_keurig_coffee_maker.pdfIn PDF document text
    • http://vudutuvugovi.epizy.com/naditazupovomanusota.pdfIn PDF document text
    • http://redepulevinevux.epizy.com/6994516579.pdfIn PDF document text
    • https://d848e4b6-662b-4424-a759-963270729452.filesusr.com/ugd/30e015_46eabbcb3fc440d4bcb6f0c65b546390.pdf?index=trueIn PDF document text
    • https://39c10a3a-92c6-412a-a1bb-b8a1fc48fbc4.filesusr.com/ugd/259099_2f92c08bad1a4c42b7eb4658f32ea8c9.pdf?index=trueIn PDF document text
    • http://zemoragigumugi.rf.gd/free_to_word_converter_software_for_windows_10.pdfIn PDF document text
    • http://vivavopiz.rf.gd/chava_marathi_kadambari_download.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_off00010392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10392 5188 bytes
SHA-256: b7c7844bf0d9c11ec6cd0904b78fd507d87e60ac9c75029f208856943131e725
font_01_sfnt_off00011563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11563 11420 bytes
SHA-256: 6eafeeb304d8459d1ec1238908e1509e7e0da3e32ed1f1655475396efef0ea99