Malicious PDF — malware analysis report

Static analysis result for SHA-256 da751ee2ea54c716…

MALICIOUS

PDF

75.3 KB Created: 2021-02-25 03:10:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 016f8448e2e686165d8772c3f2bc7115 SHA-1: dfed9f5f7397e5928eba2bc6aaaf595c013220af SHA-256: da751ee2ea54c716f1eb8e173abb161ad3240e59b124eb5bf7a4b7cd623e4920
134 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of multiple external URLs, including one pointing to a link farm on disposable hosting, suggests an attempt to redirect users to malicious content or phishing sites. The heuristic 'SE_DOWNLOAD_BUTTON' further supports a lure-based attack pattern.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://seumenha.ru/123?utm_term=android+chrome+flash+player+not+working PDF link annotation
    • https://metifipiwe.weebly.com/uploads/1/3/1/1/131164131/gakadefowuxewerurawu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426422/normal_6008ba849223f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468289/normal_602a95d6e5ec1.pdfIn PDF document text
    • https://cdn.sqhk.co/jipogidara/Yjegcij/ufc_254_fight_payouts.pdfIn PDF document text
    • http://gagimubu.mywebcommunity.org/paburofogadu.pdfIn PDF document text
    • https://wigabededonekan.weebly.com/uploads/1/3/0/7/130740374/1807067.pdfIn PDF document text
    • https://cdn.sqhk.co/retesixabe/hQifJge/tebutareg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366004/normal_6003b1aa96479.pdfIn PDF document text
    • http://xejopegig.mypressonline.com/xuwojuvorubulu.pdfIn PDF document text
    • http://taforojujutusig.mygamesonline.org/67252764982.pdfIn PDF document text
    • http://kamikofonem.mygamesonline.org/how_to_use_an_8_qt_instant_pot.pdfIn PDF document text
    • http://wotukujis.sportsontheweb.net/wejizugudidikugejalije.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/nightmare_king_grimm_theme.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_off0000e84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84C 5816 bytes
SHA-256: b498252f3bdcc34a99c3ce2d64acbc1fb0eda430bfe37e1d8ccce583c3eac05e
font_01_sfnt_off0000fc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC10 10504 bytes
SHA-256: 750c03ca60652303bed082a8f33c9cee224dd1bf8fc0e573634284fcc2217b5e

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