Malicious PDF — malware analysis report

Static analysis result for SHA-256 13b7a6cff7a974c8…

MALICIOUS

PDF

107.8 KB Created: 2021-03-02 02:44:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: e9bf36c9a44ec90e0161c97e2568c2f0 SHA-1: 75a51bec68504fcde855821c5329d322b1c81132 SHA-256: 13b7a6cff7a974c871ea58e4568ab7eaf9393adab9881622332ad63f738b7f97
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, suggesting a phishing or SEO poisoning campaign. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/wix?keyword=suqah+task+guide+osrs PDF link annotation
    • http://kixiwogazu.sportsontheweb.net/fafokalul.pdfIn PDF document text
    • http://jewogipuwivi.medianewsonline.com/what_is_narrative_in_film.pdfIn PDF document text
    • https://nolopatemima.weebly.com/uploads/1/3/4/5/134583633/bosin_mipavu_febuloj.pdfIn PDF document text
    • http://xuzerujagojagip.scienceontheweb.net/kajodedaduvijilo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468286/normal_601f1175b968b.pdfIn PDF document text
    • http://vumamanepu.sportsontheweb.net/how_to_write_a_book_summary_examples.pdfIn PDF document text
    • https://cdn.sqhk.co/kajipazuto/dMghAgj/jepaloropaxonod.pdfIn PDF document text
    • http://xolokukifimiv.sportsontheweb.net/lojedu.pdfIn PDF document text
    • http://komaxinatobofe.medianewsonline.com/what_is_a_good_book_of_the_bible_for_couples_to_read_together.pdfIn PDF document text
    • http://memisada.mygamesonline.org/body_ritual_of_the_nacirema_summary.pdfIn PDF document text
    • http://zixudivibudizu.scienceontheweb.net/american_gods_trailer_season_1.pdfIn PDF document text
    • https://kebetesoma.weebly.com/uploads/1/3/2/6/132695457/9335841.pdfIn PDF document text
    • http://sodowetan.mywebcommunity.org/girl_boss_podcast_spotify.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490122/normal_601ba74492972.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duziroro.myartsonline.com/tefeweximapalobafubizu.pdfIn PDF document text
    • http://gixiluvigatekij.atwebpages.com/brother_ls_2125_price_uk.pdfIn PDF document text
    • http://noroved.myartsonline.com/3516981562.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_off00016b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B94 5348 bytes
SHA-256: c3af551acda6a3349a4ef5bf42848be0e9c8ae59f07d327cbe45b0fd35243e12
font_01_sfnt_off00017db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DB8 10556 bytes
SHA-256: b909dba223caad4072a55d5ec606bf1911cae371b8a178cad6d6e980f5f1e436

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