Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f9b336b8933e9b…

MALICIOUS

PDF

79.2 KB Created: 2021-05-28 13:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 64ecbeffed3c9f80cf9916f8cdab26b2 SHA-1: 5340799c660abed641c311c06b7e70861eabcae9 SHA-256: 84f9b336b8933e9bc95310275b9bd1082cd2583637bcd312d0fff8d3e40a8d90
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://zajinet.ru/123?utm_term=greek+alphabet+list+pdf PDF link annotation
    • https://fedofiri.weebly.com/uploads/1/3/2/6/132681193/4677788.pdfIn PDF document text
    • https://xunimolozabipos.weebly.com/uploads/1/3/2/6/132681728/mejezamoni-bogujugazivizu-fuwezejenubu-takigifuxuja.pdfIn PDF document text
    • https://ximafirufiwazi.weebly.com/uploads/1/3/4/7/134755441/2218709.pdfIn PDF document text
    • https://nalusopiko.weebly.com/uploads/1/3/3/9/133997408/neromitabukafuziri.pdfIn PDF document text
    • https://mamifonor.weebly.com/uploads/1/3/1/1/131163935/3395921.pdfIn PDF document text
    • https://tonezesonor.weebly.com/uploads/1/3/2/6/132681734/vavexutufusububares.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480743/normal_605b9fd7ca825.pdfIn PDF document text
    • https://kadutazufe.weebly.com/uploads/1/3/4/6/134639852/fazomatudamivom_pumenejan.pdfIn PDF document text
    • https://sifapovidajep.weebly.com/uploads/1/3/0/7/130738911/koselizulorari.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374957/normal_5ff8b2fd4af30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475728/normal_603086f80a89c.pdfIn PDF document text
    • https://wanalupegekiful.weebly.com/uploads/1/3/4/8/134879682/3136627.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365582/normal_606cb4dbd08b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494663/normal_606a414cb5024.pdfIn PDF document text
    • https://tazeviguso.weebly.com/uploads/1/3/4/3/134339516/1465695.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382194/normal_6048fcb05c435.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/9dcaf78c-e1a1-4eb8-970c-e902b13bb060/whats_a_chicken_cutlet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13f04ca1-3243-4290-ab41-e89aa0ff8616/echo_pb_250_fuel_line_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10e5484d-000e-4159-b734-47fa52b5531b/34114899145.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5233987d-c8a6-46ec-9e40-b51ca88a250b/68495456919.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_off0000e986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE986 5364 bytes
SHA-256: 708028867b3125734020bfbaea94126ec685ba8ed0b2f6be6a8d490c7b3bf59e
font_01_sfnt_off0000fbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB9 17308 bytes
SHA-256: bd007098a32c87f4d4a210f4903341812e8018984198942724ab4a3e3001f0c9

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