Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bf943ad747b51a2…

MALICIOUS

PDF

64.5 KB Created: 2021-02-25 00:22:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 6aed3dd82a022e2aaaf447f70f2727e3 SHA-1: c8d426bca188c484289047e85f6f2524f6c29bfe SHA-256: 4bf943ad747b51a2a21f8d93d917250c96373d2378030f52a65d65377bd40742
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://bologen.ru/123?utm_term=comcast+remote+will+not+control+tv+volume PDF link annotation
    • http://kedugobepuged.mywebcommunity.org/free_download_tableau_desktop_32_bit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448743/normal_602a114a0791a.pdfIn PDF document text
    • http://pakirekugep.scienceontheweb.net/52472858251.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380210/normal_6036cbe4bc332.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486220/normal_5feb7f357793a.pdfIn PDF document text
    • http://sujabupinoda.scienceontheweb.net/sony_cyber_shot_dsc_h300_lens_removal.pdfIn PDF document text
    • http://delinapod.mypressonline.com/hp_elitedesk_800_g1_mt_desktop_pc_power_supply.pdfIn PDF document text
    • https://nunevebola.weebly.com/uploads/1/3/4/8/134846747/2464180.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366660/normal_6035819e18264.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/xefezesebusu/28215491261.pdfIn PDF document text
    • http://lobopekogolo.onlinewebshop.net/easy_ratio_math_problems_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/ca_arcserve_backup_agent.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/close_to_you_carpenters_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/android_toolbar_shadow.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/george_washington_farewell_address_answer_key.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_off0000c282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC282 5000 bytes
SHA-256: ff6f5d14c44f9d3cc5b9a4bbe75dcc1cdcbd212b9dea2c2caad9cd6cc25b7a6e
font_01_sfnt_off0000d379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD379 9888 bytes
SHA-256: c603430999e2b9737873e553c04eede8823c6d32905072652e1224c9f7894137