Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8176c476f4ebb5c…

MALICIOUS

PDF

76.0 KB Created: 2021-05-14 06:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6cc06bde5f88c4ec2923c276f70b818c SHA-1: 110aa2102056c664ad83edd8837243c053bbbc5c SHA-256: d8176c476f4ebb5ccb6a406829331c94621ab49049204f891a01fe4cb48c4a31
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 0.9991

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://lozipotod.ru/strik?utm_term=ryobi+cordless+chainsaw+36v+manual PDF link annotation
    • https://wiwofuda.weebly.com/uploads/1/3/2/3/132303082/3247456.pdfIn PDF document text
    • https://vunivejo.weebly.com/uploads/1/3/4/2/134266425/tubujufiwabupop.pdfIn PDF document text
    • http://fulukegoror.getenjoyment.net/10559778331.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502178/normal_5fe82617b2656.pdfIn PDF document text
    • http://vazawujuzu.sportsontheweb.net/digidozepesibowixano.pdfIn PDF document text
    • https://jamakebowixon.weebly.com/uploads/1/3/4/4/134477175/6a85b40da23fad.pdfIn PDF document text
    • https://wilasumoleliwu.weebly.com/uploads/1/3/1/4/131414134/88bb90.pdfIn PDF document text
    • https://rumodabumuxe.weebly.com/uploads/1/3/1/8/131857513/megepapesiwad_gopupu.pdfIn PDF document text
    • https://somubafe.weebly.com/uploads/1/3/4/4/134444697/tawaduz_kunubofefivuk_sekexerujakabol.pdfIn PDF document text
    • https://livabobuladezer.weebly.com/uploads/1/3/0/8/130874084/luxelenimozip_najepanejepibup_bejatupe_fobovariruzasi.pdfIn PDF document text
    • https://bozuwosumexoxal.weebly.com/uploads/1/3/2/6/132682772/58697.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383916/normal_5ff7d28ba7499.pdfIn PDF document text
    • https://zikakivoso.weebly.com/uploads/1/3/4/6/134600150/7f6c0abf516.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386849/normal_601fc8dc2172a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446147/normal_6025f85925fee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_61868190011a415bac484b819a0c1efb.pdf?index=trueIn PDF document text
    • https://9e084d23-5bbf-42ad-98e9-fa9200f8584e.filesusr.com/ugd/4f663b_da9ca6c3cb374cb4be5c13f8eb598e69.pdf?index=trueIn PDF document text
    • https://f1e11ea9-a931-46ad-af30-391325c877dd.filesusr.com/ugd/423518_bc47b9d5f8264cd3beb30ad0225570ed.pdf?index=trueIn PDF document text
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_60dec3e2b61e40b580c5a3d05e164749.pdf?index=trueIn PDF document text
    • https://9a86171b-24d8-4f43-8717-687e75280c8f.filesusr.com/ugd/6234e8_43bd64c4a4894b08946a26e141654d65.pdf?index=trueIn PDF document text
    • https://07d68bf2-0661-47e2-9ffe-eae068a071af.filesusr.com/ugd/fef806_433553efd3914c438c92d9bf0b480177.pdf?index=trueIn PDF document text
    • http://nosigegu.onlinewebshop.net/gexol.pdfIn PDF document text
    • https://d8d078ea-10ec-4787-8e21-ef6e32b87a24.filesusr.com/ugd/8f6098_3261b4946c2f472c9dfc88c64cd8c006.pdf?index=trueIn PDF document text
    • https://6f4861c6-cdf0-4a5f-ba2d-f9c5e5bfbee6.filesusr.com/ugd/77941b_e93aef2e40f5411c85ba60ec9520c4f0.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB14 5900 bytes
SHA-256: 7a7bb7e3cc64b9d519336056c8caf728e664d4e09de9b906ac20a53f86d1cd79
font_01_sfnt_off0000ff19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF19 10372 bytes
SHA-256: afc537f9eea7b3ffc36bd2cd569871b7214d350b436625cbdb05517e9cd410bd