Malicious PDF — malware analysis report

Static analysis result for SHA-256 0839d743bb674322…

MALICIOUS

PDF

69.3 KB Created: 2021-02-24 03:26:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ce57ee25773f40e1f92e48793ba00f86 SHA-1: 21027723c7c6f94499093f7b8f002aa307323c22 SHA-256: 0839d743bb67432266dca7bfd658e066af68b7bdf5cb8c0e35993d4d6ba2e102
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with a high-confidence heuristic indicating an invisible link to a suspicious domain, likely intended to trick the user into downloading a malicious payload. The ML classifier and ClamAV detection strongly suggest malicious intent, consistent with a phishing lure.

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://bologen.ru/strik?utm_term=is+white+fang+a+good+skateboard+reddit PDF link annotation
    • https://cdn.sqhk.co/guwuweri/adHhhic/gupivamerogememirebawok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419644/normal_5fceb51a014e3.pdfIn PDF document text
    • http://securitycheckingbrowservkcom.xyz/kudefexonelapixm9q7.pdfIn PDF document text
    • http://verifiedbadge-lnstagram.com/giorno_theme_trumpet_sheet_music6yavx.pdfIn PDF document text
    • http://juzajikadig.22web.org/messenger_apk_for_android_4._2._2.pdfIn PDF document text
    • http://copyrightnotice-ig.com/20063420669t7h35.pdfIn PDF document text
    • http://poverkavoda.website/rascal_pioneer_mobility_scooter_reviewszk5zw.pdfIn PDF document text
    • http://50offit.pro/how_to_remove_water_from_lg_top_load_washing_machinedvm2k.pdfIn PDF document text
    • http://vesimawamom.66ghz.com/42111379741.pdfIn PDF document text
    • http://tehnotop.store/vogoxusalomolucd9.pdfIn PDF document text
    • https://cdn.sqhk.co/xamowizaso/kx0iaO9/7367683654.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zusunikumejimet.rf.gd/xabuvirazotanuvumoberoz.pdfIn PDF document text
    • http://noxetowukamav.epizy.com/bookies_list_crossword_answer.pdfIn PDF document text
    • http://badubitoj.epizy.com/importance_of_female_education_essay_in_hindi.pdfIn PDF document text
    • http://xesupunugotim.rf.gd/kimevexut.pdfIn PDF document text
    • http://xedovafimolodem.epizy.com/zotinigufenowutu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC708 5160 bytes
SHA-256: c520a376b48e374b1aa1e44311032c8d79204406ca3c8be8c5c6de34eb52d4b5
font_01_sfnt_off0000d893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD893 9748 bytes
SHA-256: 6e3a1d26434aed78de33af61103a6db8cc71ccfa46fb5295056c9560fd439d82
font_02_sfnt_off0000f9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E7 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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