Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5d6bc723b7e3c97…

MALICIOUS

PDF

94.1 KB Created: 2021-03-30 10:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: bb56baa16eac30b35e8ef59f610b5c2b SHA-1: ba0fc22ef8be031ccbd5c948e1677116b5b4992c SHA-256: f5d6bc723b7e3c97aafdf6547a25a06fdf8a71b95c920a2b26b30fdedeaae642
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to disposable domains and Weebly-hosted PDFs, indicative of a link farm. Heuristics like PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM strongly suggest this malicious intent. ClamAV detection and ML classification further confirm its malicious nature, likely as a phishing or SEO spam document.

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://soxebez.ru/award?keyword=serie+a+2020+20+calendario+pdf PDF link annotation
    • https://duzetokip.weebly.com/uploads/1/3/4/4/134404829/1734de4.pdfIn PDF document text
    • https://detatabuloto.weebly.com/uploads/1/3/5/3/135346227/gepajuxexodofom.pdfIn PDF document text
    • https://katozela.weebly.com/uploads/1/3/0/8/130874493/jituseworopux.pdfIn PDF document text
    • https://jelalepoxona.weebly.com/uploads/1/3/4/9/134901657/8187419.pdfIn PDF document text
    • https://turexebino.weebly.com/uploads/1/3/4/2/134265835/bde481c.pdfIn PDF document text
    • https://jepololazatozuj.weebly.com/uploads/1/3/4/6/134601538/8951051.pdfIn PDF document text
    • https://kabosasano.weebly.com/uploads/1/3/5/3/135398154/4964699.pdfIn PDF document text
    • https://gamepasak.weebly.com/uploads/1/3/4/1/134109087/lulabesojoxonitoxipi.pdfIn PDF document text
    • http://zipinamo.iblogger.org/since_for_just_already_yet_ever_never_exercises.pdfIn PDF document text
    • https://lumirofelefepo.weebly.com/uploads/1/3/4/8/134892557/1392489.pdfIn PDF document text
    • http://vavimaj.iblogger.org/76002967016.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/0707627b-de6a-4a99-82c6-626ae209a924/mitisuzerefinobapora.pdfIn PDF document text
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_8eb08e1d914542c78829714bc6efb2b1.pdf?index=trueIn PDF document text
    • https://1e6856c5-1481-42a3-8d1a-2a2567f9fa5a.filesusr.com/ugd/a8b033_987af6145bcd405ebb88fb2058553e26.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5350fa17-7eff-410f-ae84-6ca88ec6f240/shade_of_vampire_book_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e4bedeb-213e-4253-9a0d-3f8f41abf11b/shimano_di2_junction_box_lights_flashing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84853ce4-2dcc-4088-ac54-554f63395291/quicken_print_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbd65795-d253-4292-b2f8-f43371f0add8/man_the_unknown_book_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e7c32b8-22de-451c-8ecb-483c4988f23c/bovaritisepeni.pdfIn PDF document text
    • https://9e2b3e3a-6a02-4d3b-8ba9-5acc01041672.filesusr.com/ugd/66c878_a4801a682bb44a3aa3d3a34ef06cb9ab.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/62cc8fc8-029f-454d-a13e-f6fdb65b084d/22781120906.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11459 5348 bytes
SHA-256: 41625b2a50e5b4e006e957a0fd60d6be095eaa99ce29727f8ebc52e360bd57c9
font_01_sfnt_off00012697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12697 15752 bytes
SHA-256: 72529af614e2612f839d84400ad983ef4e9cdeab62dc5e4935fac63b9bb2697f
font_02_sfnt_off00015464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15464 16064 bytes
SHA-256: 2ab85f5f084fe11b94e74309fffab84832e8b82947a8819311f607ca1406fb96

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