Malicious PDF — malware analysis report

Static analysis result for SHA-256 f004045361cb2200…

MALICIOUS

PDF

80.4 KB Created: 2021-03-28 13:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 17d540cf6556ed3cf944d7c928552da4 SHA-1: c6d0c33bea2042012e89d3e3be2a157da001cd10 SHA-256: f004045361cb2200e442642fcceac3730fa67b63dfce79a3d67b9d0d5b255e16
244 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm. One critical heuristic identified links to known malicious redirector infrastructure, and ClamAV detected it as Pdf.Phishing.Trojan. The ML classifier also flagged it with high confidence. The document body is largely unreadable, but the presence of 'Periodic table set' suggests a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • 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.
  • 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://yafferge.ru/wix?keyword=periodic+table+set In PDF document text
    • https://vijuvunido.weebly.com/uploads/1/3/0/7/130740607/9c0f5f91a2f9.pdfIn PDF document text
    • https://koxowugazetumul.weebly.com/uploads/1/3/6/0/136015765/29a37b9eb0a9.pdfIn PDF document text
    • http://tejasatobes.medianewsonline.com/44725920032.pdfIn PDF document text
    • http://tibudirowe.mygamesonline.org/human_anatomy_and_physiology_all_systems.pdfIn PDF document text
    • https://cdn.sqhk.co/novimabe/iLgdhea/80541338325.pdfIn PDF document text
    • https://jipofaxinevafud.weebly.com/uploads/1/3/4/3/134350183/3536286.pdfIn PDF document text
    • https://cdn.sqhk.co/jibezilesu/DKjjgeV/solurunapubujoxow.pdfIn PDF document text
    • https://cdn.sqhk.co/dusimefosix/YcBgg9o/pujotesepabekefej.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwadezab/gePiagg/94048512454.pdfIn PDF document text
    • http://boguzimaro.getenjoyment.net/gowezemitomelibutuzofu.pdfIn PDF document text
    • http://fojukivijivik.medianewsonline.com/can_you_make_pie_dough_in_a_kitchenaid_mixer.pdfIn PDF document text
    • http://rexevivejegox.scienceontheweb.net/little_fires_everywhere_season_1_episode_4_recap.pdfIn PDF document text
    • https://xowesujitevenas.weebly.com/uploads/1/3/5/3/135321640/linevefajivopuje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kufekisawisewo.onlinewebshop.net/63653668881.pdfIn PDF document text
    • https://4c2674ec-1430-4cec-a455-d6a35d10586e.filesusr.com/ugd/38955b_59fbec5d77fb408382db366e92d90221.pdf?index=trueIn PDF document text
    • http://kebenubes.onlinewebshop.net/ignou_assignment_front_page_file.pdfIn PDF document text
    • http://wudazebej.atwebpages.com/send_attachment_in_mail_php.pdfIn PDF document text
    • https://3633ae4e-9acc-45df-885e-1bfa1481cb44.filesusr.com/ugd/e73054_e62fd9f4d36848f999b12dd538cbd7f7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b7d5b3e-99c9-4b31-836b-148629d13aac/youtube_peter_dawson_on_the_road_to_mandalay.pdfIn PDF document text
    • https://51bf459c-6b46-41b0-863f-532cf8a77e0d.filesusr.com/ugd/2eedf1_557d8e8322524ca0bd6367a00eaa7387.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7b8d9ac-8431-4d47-87f9-35d451ffd742/22196934702.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac2d911c-a478-45e8-80d8-9693bab85a8a/senituvosilefuluviludexa.pdfIn PDF document text
    • https://e5eb5b25-b33c-43e3-82d5-57ab1bf863d8.filesusr.com/ugd/b0c717_3a3f3be7f2784783986c6145b0e1d867.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8670eddd-43b6-42a3-a449-ed88931ea29c/common_nouns_exercises_for_class_3.pdfIn PDF document text
    • http://sefowolo.atwebpages.com/53173624517.pdfIn PDF document text
    • http://bolirazebaf.myartsonline.com/their_eyes_were_watching_god_audiobook_chapter_18.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d46fd51-8a2a-4052-ae77-7c42d10d2563/bsc_interior_design_colleges_in_pune.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_off0000fdc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC9 5072 bytes
SHA-256: 435768c66ae58d268c8bf139f350ce1062a786c03dc44c9a2926c49a50435b36
font_01_sfnt_off00010f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0C 10836 bytes
SHA-256: 1cfd88f94edf24785fb52c1bc072404d22f85d2083f89e8fa3597e697c3a2ef5