Malicious PDF — malware analysis report

Static analysis result for SHA-256 722f8f8c4b90cdc6…

MALICIOUS

PDF

75.9 KB Created: 2021-05-03 14:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 869406490c6c95726af16e70d4d64fa2 SHA-1: 8b7a7a7743d9bdbed3a708bf7c2a1c85b4519f90 SHA-256: 722f8f8c4b90cdc66090a493a7d93a9ffbd8c6f6e2d42b059f7d077b8be1c510
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-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://lozipotod.ru/strik?utm_term=metroid+prime+4+original+release+date PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4422168/normal_5fc8d71636c52.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378170/normal_5fce47230a548.pdfIn PDF document text
    • https://zupevojug.weebly.com/uploads/1/3/0/7/130740492/josik_sajorunupa_lefolutulanok.pdfIn PDF document text
    • https://vemuwusikive.weebly.com/uploads/1/3/4/7/134733059/34bbed0d5dfa.pdfIn PDF document text
    • https://xunumiselodaz.weebly.com/uploads/1/3/0/7/130775676/giviwixefutabiluva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404503/normal_6038d55649c2a.pdfIn PDF document text
    • https://nerukime.weebly.com/uploads/1/3/1/3/131379394/6923029.pdfIn PDF document text
    • https://filuramaz.weebly.com/uploads/1/3/4/3/134314207/7a1b777ae8df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378171/normal_604daae97e68e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450003/normal_601280d7cb452.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4528915/normal_5fcc002c2aba3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408719/normal_603cf7bc82285.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495065/normal_5fdd7519799a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459463/normal_602e8374e6377.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374835/normal_5ffb8c0cb7195.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485015/normal_5ffae83e5eb76.pdfIn PDF document text
    • https://winiwezunubesu.weebly.com/uploads/1/3/1/3/131379740/bululusozubip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388052/normal_5ff13d1195f6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422371/normal_601cf10a57d6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477623/normal_6035497f35195.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ebbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBC 5372 bytes
SHA-256: de62b23e6f0218b3013df1d1af768e442e3f56b57483105d9d2c8233e63755d4
font_01_sfnt_off0000fdfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFC 10548 bytes
SHA-256: 63c672ad3a9d4cda8656afe86ca93f0adbd5ba68052f115d357ecc43d83e5da5

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