Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3d239c99766175c…

MALICIOUS

PDF

74.5 KB Created: 2021-03-25 21:12:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3fa2497c6dddbaaa7f49745c14b922f4 SHA-1: e6828b3e09110c08fc4e012cfd4371db76023206 SHA-256: f3d239c99766175c9db6bbeac8e1741bba448982f801df203797bedec7b798b5
244 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to disposable domains and redirectors, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the structure and embedded URLs are indicative of techniques used to redirect users to exploit kits or phishing pages.

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
  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/123?utm_term=php+ajax+form+serialize In PDF document text
    • https://cdn.sqhk.co/bibikodazit/gaZljbs/nusoronawola.pdfIn PDF document text
    • https://cdn.sqhk.co/retobumoki/icRxgcJ/super_mario_3d_world_wii_u_amazon.pdfIn PDF document text
    • https://cdn.sqhk.co/buvaboda/jbQjhKm/best_apple_watch_6_screen_protector.pdfIn PDF document text
    • http://sowivonowiso.iblogger.org/undertale_ost_sans_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/ditutafewaw/gjniVjj/first_grade_reading_worksheets_free_online.pdfIn PDF document text
    • https://cdn.sqhk.co/norejasiwiza/ifrQlUb/6385083707.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/jalasilunaz/instrumentation_tools_pro_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ede74ce0-69fe-413b-9e45-2958df39a8e9/fubebazudenebuva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/546ae0ed-9db2-41f9-94de-166ffd1aaaf4/xixore.pdfIn PDF document text
    • https://cc6d8859-fc08-4100-a073-55b48c5addfc.filesusr.com/ugd/238140_bffa47f7768746c2a4c5bcc312f387f7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kotodur/algal_toxins.pdfIn PDF document text
    • http://xamaruver.epizy.com/kibujem.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/beethoven_piano_sonata_no_15_imslp.pdfIn PDF document text
    • https://dce579ed-4708-43c3-aaeb-2c76a6268d78.filesusr.com/ugd/944939_defd8e72c9f74c7f85bbac1528dd1a1c.pdf?index=trueIn PDF document text
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_023b61fb13264d7f8e396fc667dddd1c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/af7e188b-c446-41d9-b4e0-7d7252acc220/jitenuvur.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/algebra_1_staar_test_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/xezonijida/photoshop_cs6_brushes_pack_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vanatul/nizuliti.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_off0000e575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE575 5336 bytes
SHA-256: 0f3db5da402e1d0f44eab984ef6c609d819c1a4f32f1158faff33b8ada5a7a29
font_01_sfnt_off0000f788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF788 10620 bytes
SHA-256: 1c3c1e467ae556a9b69f3eea926b63db62f2938bb17ebefe87230d169a21e628

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