Malicious PDF — malware analysis report

Static analysis result for SHA-256 1714c85c1909a626…

MALICIOUS

PDF

109.7 KB Created: 2021-02-16 09:08:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e24ef645016e70374ce53ff8bdd7946f SHA-1: 6af020b695b7951222611301c92561b871168998 SHA-256: 1714c85c1909a62633a139a018606479666214da5130653c6316d87324967d3f
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, suggests a lure related to 'cost of living index', directing users to potentially malicious websites. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing campaign aiming to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://maypoin.ru/123?utm_term=cost+of+living+index+by+city+international PDF link annotation
    • http://life-news.tech/wabilobar3w1vv.pdfIn PDF document text
    • https://rudunusom.weebly.com/uploads/1/3/4/6/134602981/nariden-zavoleba.pdfIn PDF document text
    • http://helplnstagramcontact6088757.com/mv_bts_idol_mp4_wapkafjtux.pdfIn PDF document text
    • http://aslixan.com/katya_elise_henry_workout_freeh4bel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479715/normal_60270b1c9e4dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413977/normal_600a938d85017.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445343/normal_600e6083a419e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492246/normal_5fd5f0c68ab8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387240/normal_6013321ef2ba9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455901/normal_5fd28ac54c27e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bolunivagoxel.epizy.com/xaguxunuzuku.pdfIn PDF document text
    • http://rotitow.rf.gd/hola_extension_for_chrome.pdfIn PDF document text
    • http://revifobatuge.rf.gd/bavixedunov.pdfIn PDF document text
    • http://xukaneteris.epizy.com/english_alphabet_writing_guide.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_off0001595a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1595A 5464 bytes
SHA-256: 97178d3d63be98952309509aa21e483360bebbf2fd9b5a9e2383e5e5b7d05bba
font_01_sfnt_off00016c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C0D 11856 bytes
SHA-256: dc1cdca1f73cf1e05c6f85439b9c941c16d561a472d653263b4bf10fdb5a13c2
font_02_sfnt_off00019221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19221 16076 bytes
SHA-256: 72df47e042a7798fa8fabf70dc0f825ff51d076e250e44cf14d7482e3a7c1353

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