Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c733a49c58df556…

MALICIOUS

PDF

73.2 KB Created: 2021-02-24 18:45:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 636d4e08431d4647713a5b3b4e0357cc SHA-1: 6ebccea459bff02a8af6716b6298b3d02c97c77f SHA-256: 1c733a49c58df5569f3922f9d1c6c34e6516cb63b526268d74d6bfe7371ffb57
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to disposable domains and redirector infrastructure, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=what+is+a+cross+cultural+experience In PDF document text
    • http://sowopezamiw.medianewsonline.com/how_to_determine_windshield_wiper_blade_size.pdfIn PDF document text
    • http://gosoxegekiri.mywebcommunity.org/modo_de_produccin_de_la_comunidad_primitiva.pdfIn PDF document text
    • http://qupieasy.online/desexobacj0pv.pdfIn PDF document text
    • http://likedizar.medianewsonline.com/maytag_quiet_series_300_no_water.pdfIn PDF document text
    • http://avbox.org/15303524323vctaz.pdfIn PDF document text
    • http://xozapab.22web.org/how_to_check_my_notary_status.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464732/normal_603187392d370.pdfIn PDF document text
    • http://jirafka.space/73001863630gmk6b.pdfIn PDF document text
    • http://item-get.top/52469428987qq6zn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481271/normal_60260ccc5b7e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496402/normal_5fd1c61b52831.pdfIn PDF document text
    • http://luvatok.66ghz.com/fudedumekiku.pdfIn PDF document text
    • http://tafugegajotu.mygamesonline.org/firex_hardwired_smoke_detector_installation.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/remavuj/18613463238.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/brazil_visa_application_form_for_pakistani_nationals.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/eurydice_sarah_ruhl_full_play.pdfIn PDF document text
    • http://nabenejajoko.myartsonline.com/soundcraft_ui24r_manual_cz.pdfIn PDF document text
    • http://fukokikedusej.epizy.com/bezezukowerewipeza.pdfIn PDF document text
    • http://bopunuzas.rf.gd/61298391559.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_off0000e680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE680 5104 bytes
SHA-256: 0df50c93c5e907996bedede40ac50fd727d7e03394f215279f197b439beb0791
font_01_sfnt_off0000f7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E5 9144 bytes
SHA-256: f7e3f6b744fd3992b1b80a8b2889bb159afd9c19c5d5cb8ded5381601c72183b

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