Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9357f332b224613…

MALICIOUS

PDF

73.7 KB Created: 2021-02-25 03:18:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 058ce337851b7050eba16ee493b7e5b0 SHA-1: 4f7745f531156bf6772d75c637cee0d65d423c2b SHA-256: f9357f332b2246131da6ddafcd15820e776e612e06cd4908b031eb2da78d389f
246 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to attract search engine traffic. The heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document may also attempt to trick users into revealing sensitive recovery information. While no scripts were explicitly extracted, the PDF structure and extensive link farm are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://jacksth.ru/award?keyword=mcgraw+hill+cissp+all-in-one+exam+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501198/normal_6028987cf2b9a.pdfIn PDF document text
    • https://cdn.sqhk.co/zinumazak/eQZuhdu/95992879944.pdfIn PDF document text
    • https://cdn.sqhk.co/nowavutu/jfgfihJ/guledinifefa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470979/normal_60251029a8e77.pdfIn PDF document text
    • http://nakekizedexu.getenjoyment.net/how_to_write_essays_for_university.pdfIn PDF document text
    • https://parafobosa.weebly.com/uploads/1/3/1/8/131857791/f1ca4422.pdfIn PDF document text
    • https://ninegepidilu.weebly.com/uploads/1/3/0/7/130738727/jimukojinu.pdfIn PDF document text
    • https://girewatadetax.weebly.com/uploads/1/3/2/6/132681062/girovidas.pdfIn PDF document text
    • http://rexevivejegox.scienceontheweb.net/84926544560.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481061/normal_5ff04414e702e.pdfIn PDF document text
    • https://silajawa.weebly.com/uploads/1/3/4/3/134339193/a00a1e9051149.pdfIn PDF document text
    • https://sedogosep.weebly.com/uploads/1/3/4/4/134486754/5668357.pdfIn PDF document text
    • https://sokunikaxule.weebly.com/uploads/1/3/4/0/134017602/5101813.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_off0000e229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE229 5684 bytes
SHA-256: bc4e3b97028a373b5573e95e37116a48f21428d8b56461cec1631a40feeb8680
font_01_sfnt_off0000f57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57C 10612 bytes
SHA-256: d6095114a36c897de05dd9d59aed8726bac00f17accf09acdac7f27f10fbebfd

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