Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a6f92e34aeb8c27…

MALICIOUS

PDF

75.4 KB Created: 2021-02-25 10:34:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: b16a37a29cc9668bc9988eca79c1da93 SHA-1: 833a1256d46362b2bac756a0f2f793e165b6c3ab SHA-256: 3a6f92e34aeb8c27c83816451728374fd60c4973ab2e5350dbd5c9c7759b1afe
254 Risk Score

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.
  • 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.
  • 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://crophysi.ru/123?utm_term=basic+physics+a+self-teaching+guide+filetype+pdf In PDF document text
    • https://gumelajijepepa.weebly.com/uploads/1/3/4/6/134639918/bitebetagoribex.pdfIn PDF document text
    • https://fisabovetusita.weebly.com/uploads/1/3/4/5/134597566/e97085de17.pdfIn PDF document text
    • http://winovigamaj.mygamesonline.org/13483248690.pdfIn PDF document text
    • http://worabipupe.mypressonline.com/7046033470.pdfIn PDF document text
    • http://mumolazesinidix.getenjoyment.net/sutuwupudeborup.pdfIn PDF document text
    • https://cdn.sqhk.co/gotofebelu/W7VIhfr/tie_dye_sweatpants_set_urban_outfitters.pdfIn PDF document text
    • https://mikezibe.weebly.com/uploads/1/3/1/4/131453119/4317823.pdfIn PDF document text
    • https://cdn.sqhk.co/buvaboda/4fjfGNC/commander_cody_helmet_3d_print.pdfIn PDF document text
    • http://vumonivaxozutod.mypressonline.com/karomilokofomekanoleko.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/juduk/27375846437.pdfIn PDF document text
    • http://zoxokukazo.epizy.com/c_h_o_ki_full_form.pdfIn PDF document text
    • http://vomajifinudunu.epizy.com/vumulegononoziv.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/kerbal_space_program_control_surfaces_inverted.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/12_column_ledger_template.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/50828250828.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_off0000ea2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2F 5504 bytes
SHA-256: 1d8f7d28aaa1d0c74391929e77ee85e4126cb860a08a444a0ef8969db76d67b0
font_01_sfnt_off0000fd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD00 10404 bytes
SHA-256: 4adbe530d2b7304b26fdced017820271e3dfe62ce9832475cebf1cc90f7668cd