Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f043d78f20138f…

MALICIOUS

PDF

77.7 KB Created: 2021-03-14 21:11:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6b16707aeb495ff986705d4e5128e500 SHA-1: 99b254d4a216f08ae1851eee33cb84dd8e4fa969 SHA-256: 55f043d78f20138fc272d27ec3de75c192c3d1bc302bbfbaffedf3c95847006a
194 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt, likely leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://midufefew.ru/strik?utm_term=c+programming+learning+tutorial PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4471479/normal_5ffdeac72b403.pdfIn PDF document text
    • http://witikotuxigere.scienceontheweb.net/63148112761.pdfIn PDF document text
    • http://forpost-electrica.ru/fishing_sim_world_guidej5gg2.pdfIn PDF document text
    • http://ostanni.fun/new_american_movie_20180cs0b.pdfIn PDF document text
    • http://basvuruizleme.online/333121447010xdiv.pdfIn PDF document text
    • http://opros.xyz/what_age_to_use_uppababy_rumble_seatw2pcv.pdfIn PDF document text
    • http://strahauto.website/kunotisepifosuxqiba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475565/normal_5fefa4b6eee89.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4a39c6c9-989b-4d11-b2d8-cc0becc7f193.filesusr.com/ugd/ef0078_dab75e78786a45a3ba462f244fefc76c.pdf?index=trueIn PDF document text
    • https://8d684a1e-4078-49cd-b336-05adf09473b6.filesusr.com/ugd/2b25e8_574e493744604ca288ca86ad352acb0c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/917cba2f-6b2d-4149-98da-8ab564992424/casio_g_shock_3031_battery_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21fc5565-dea1-4655-8483-181e25ae126f/7966913332.pdfIn PDF document text
    • http://dasobiviwadodaj.atwebpages.com/gilidemoxuteponakusowifo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da05dec8-08f2-4380-af53-3190f37b8d8e/how_much_is_a_hyundai_sonata_hybrid_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2e08667-7a36-42a8-b1e1-b3a6a47ec491/ejemplos_de_resumenes_de_trabajos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ede2652f-abb1-410a-8f18-f539ce0f944b/what_order_to_watch_the_girl_with_the_dragon_tattoo_movie_series.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_off0000f26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26C 4864 bytes
SHA-256: 3330688c046babc00e7208aa32b2779fa536150b389185d1f63fc53d7c9a59dd
font_01_sfnt_off000102e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E1 11548 bytes
SHA-256: adcd891ef224c6685e722955b3cdc355dc1ff98d899f38f602a1977053e9e2c8

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