Malicious PDF — malware analysis report

Static analysis result for SHA-256 c34ce279abcfacc2…

MALICIOUS

PDF

72.1 KB Created: 2021-03-17 08:53:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: cd00d9feb2812162c4d188cb871dc116 SHA-1: c9a55565789c2b2b488457ba354d26b5763ec1b1 SHA-256: c34ce279abcfacc2125d3736bb0174eebad1983124b3dd37b1b172e09985c7b2
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm used for phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to an 'answer key', and the presence of embedded URLs further supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://botokaw.ru/wix?keyword=figurative+language+worksheet+answer+key PDF link annotation
    • http://dmdmassage.com/76947494720ms4yj.pdfIn PDF document text
    • https://fisujurij.weebly.com/uploads/1/3/1/4/131437504/rusonimevazebiz.pdfIn PDF document text
    • https://valabonef.weebly.com/uploads/1/3/1/3/131379230/jitigelojudobe_revimikoremusil_begofo.pdfIn PDF document text
    • http://nipizakevenuvis.scienceontheweb.net/fiche_de_lecture_la_boite_a_merveille.pdfIn PDF document text
    • https://pubedazemel.weebly.com/uploads/1/3/4/8/134870130/ridaxa.pdfIn PDF document text
    • https://cdn.sqhk.co/maxokekoxo/zlicugf/expiration_date_format_uk.pdfIn PDF document text
    • http://skout.tech/sel_351r_recloser_control_instruction_manualdfro8.pdfIn PDF document text
    • http://itanah.space/pexedunizuwusubw4dnb.pdfIn PDF document text
    • http://narovomesizi.medianewsonline.com/woxowe.pdfIn PDF document text
    • https://cdn.sqhk.co/netimupoxojo/vhhghiG/honda_grass_cutter_machine_customer_care.pdfIn PDF document text
    • https://cdn.sqhk.co/fefamujigip/fujf9jj/wii_homebrew_gamecube_cheats.pdfIn PDF document text
    • https://cdn.sqhk.co/kelarega/hbefij9/tumblr_girl_coloring_sheets.pdfIn PDF document text
    • https://tonavamajarow.weebly.com/uploads/1/3/4/6/134694337/e7ffeebdd3597.pdfIn PDF document text
    • https://cdn.sqhk.co/lopijikuvi/EjcjfJ8/virgin_trains_times_and_prices.pdfIn PDF document text
    • http://lirinevewafa.mypressonline.com/methods_of_data_collection_and_analysis_in_social_psychology_research.pdfIn PDF document text
    • http://mavito.online/770974111012l4k9.pdfIn PDF document text
    • http://trend-sales.fun/how_to_mount_a_scope_on_mini_141uv2m.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_43d6c337f141425f91014227634ac705.pdf?index=trueIn PDF document text
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_3319b3120af5439cb90d6ef4e2fb5a64.pdf?index=trueIn PDF document text
    • https://5c839259-519f-4cee-a1a2-6639d654070b.filesusr.com/ugd/140efa_2f7a06402c694348bd3f2463446f0a63.pdf?index=trueIn PDF document text
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_b14a69b79e0c4429b5e57b9deea2cf82.pdf?index=trueIn 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_off0000dc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC18 5220 bytes
SHA-256: 82f07d6b71bcc5c0be66dffeb6dcaed30ca3dc9b4c714b7ab90dca0d974cf2c5
font_01_sfnt_off0000edf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF3 10216 bytes
SHA-256: 4abbbf9fc9cc9e48dd050b4d591cd50392f5c5c8cccc88bef58165389752ba95