Malicious PDF — malware analysis report

Static analysis result for SHA-256 1931fef3329ae5ae…

MALICIOUS

PDF

85.1 KB Created: 2021-02-26 12:39:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f9755716d865526fa8cb560ef39883d2 SHA-1: 2a0f59a82d7edbabf843c85412b1c2d0052a58dc SHA-256: 1931fef3329ae5aede41756bfaffe2dd810db308bfa1416cc32018326bb458ef
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links pointing to disposable domains and redirector infrastructure, indicating a phishing or SEO manipulation scheme. 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 techniques used to redirect users to malicious sites, potentially for credential harvesting or malware delivery.

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://dafemum.ru/wix?keyword=tv+guide+virginia+beach+verizon In PDF document text
    • https://cdn.sqhk.co/nivopekodi/dmxM8ax/jewakobojitak.pdfIn PDF document text
    • http://dajexori.mypressonline.com/learn_to_draw_books_for_9_year_olds.pdfIn PDF document text
    • http://sixesijilolun.mywebcommunity.org/maxenodivefodosakuvirul.pdfIn PDF document text
    • http://findfreegirl.com/muzosoboputifolap72du1.pdfIn PDF document text
    • http://bathforlegs.xyz/givaniwadasotanijosez3ne24.pdfIn PDF document text
    • https://cdn.sqhk.co/gojogefe/lidOAB0/beyblade_burst_shu_coloring_pages.pdfIn PDF document text
    • https://cdn.sqhk.co/dorodidur/whffjhg/89466315222.pdfIn PDF document text
    • https://cdn.sqhk.co/wimiwupo/xijiaic/how_old_is_melody_thomas_scott_husband.pdfIn PDF document text
    • https://cdn.sqhk.co/muvotugi/IEhjQif/nova_launcher_android_10_gestures.pdfIn PDF document text
    • http://samo-katim.ru/dragon_ball_episodes_in_tamil9gvoc.pdfIn PDF document text
    • https://cdn.sqhk.co/lerapuraroke/Xqlgcgf/ketog.pdfIn PDF document text
    • https://cdn.sqhk.co/pufowuvikij/LNMPHhi/jutelaxixibilobef.pdfIn PDF document text
    • http://intekzafast.online/balokimebawerezeja65z9s.pdfIn PDF document text
    • https://cdn.sqhk.co/wenoxavawo/jghhghg/biwapolavifafe.pdfIn PDF document text
    • http://nigasheff.xyz/5-point_likert_scale_range_interpretationokl9q.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gosaduzunake.myartsonline.com/bopadi.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_off000110af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AF 5188 bytes
SHA-256: 8996cb2d2af95950a547ddad158d3695569261bcbb5cee8bc8e63ef75f7ca9c3
font_01_sfnt_off0001225d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225D 10768 bytes
SHA-256: 4c253e28a396820513cdc133925550aca4e00b0a997d312055dfb5d523e7d13b

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