Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b7b75b300d3355a…

MALICIOUS

PDF

79.6 KB Created: 2021-04-02 05:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f97143f5ce83592e93d3b0a84c314b66 SHA-1: 7e345925aaa9f6b3202b232272cb4ef21bb47b2a SHA-256: 4b7b75b300d3355a404e3c0e4b8d3fb21a2737d7681c26dc274c547e5eff1ba7
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to a redirector URL, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. The embedded links likely serve to redirect users to malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • 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://midufefew.ru/strik?utm_term=what+order+does+the+flowers+in+the+attic+series+go PDF link annotation
    • https://ruzudagozigiwis.weebly.com/uploads/1/3/5/3/135394236/xedapubukulixo-kopap-kozobegosulo.pdfIn PDF document text
    • https://cdn.sqhk.co/jiluputumusi/cij2pjb/doom_patrol_trailer_season_1.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/heXfeia/wafefokujalidonowizeguzu.pdfIn PDF document text
    • https://cdn.sqhk.co/tenotitur/difEbja/color_by_number_animal_worksheets.pdfIn PDF document text
    • https://kedaregedowe.weebly.com/uploads/1/3/5/3/135321867/c48ec5edb1711e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496812/normal_605b6510cc4dd.pdfIn PDF document text
    • https://cdn.sqhk.co/wifinalimow/22RDhcS/57400240306.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426558/normal_6061427748873.pdfIn PDF document text
    • https://cdn.sqhk.co/netimupoxojo/HNz4jf6/nba_g_league_ignite_roster.pdfIn PDF document text
    • https://zudesamuz.weebly.com/uploads/1/3/4/6/134689191/4940667.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef275f04-949a-480c-97c8-645a0e3f6ac1/92038815109.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85c0ab7f-5a43-4c8f-9fd6-7cbf323ee7e0/24705720914.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d970ce0-1067-41cd-8a64-dd5fda39a150/wavibokifadedajuxobifisap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2aca118-f75b-40ab-b008-f943bda4285f/how_to_program_rca_remote_to_insignia_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ce86ab5-dfce-4ba3-90c5-8961a9546062/63093808782.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5273bc50-3f9b-412f-9f5b-8e821280fe36/what_is_classic_style_in_interior_design.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4c6d7c6-2815-4f52-a950-c65216d6b840/pixawimoka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de516454-85fc-4da8-a312-9388f7bd13fa/is_hp_envy_4500_a_laser_printer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61824840-e6a0-4ccb-9e42-4b6c822fa813/ww2_us_army_uniform_colors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af083dfd-ea5a-423a-a403-d002b80e977c/how_to_do_finishing_stitch_on_needlepoint_belt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d09d08d-a6d8-4d9c-975a-3785aaee029a/the_thrill_of_the_chase_poem_found.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fc06c3a-7b26-428a-b68f-fb6b6e49636b/mitsubishi_mr_slim_error_code_p8_00.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ba8a20a-a5e3-4e7f-8ca7-dd53f7b482a0/61170144803.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_off0000f971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF971 5388 bytes
SHA-256: ee2bf2c7180005f25f0919ab141ef35e2a46d7dd6deb11e0c5074b9ddb5210c9
font_01_sfnt_off00010bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDC 10908 bytes
SHA-256: 336520e012febe3197926cbf602f9ddbd2950db7b1176743886f545a53a3540b