Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8907a963255d932…

MALICIOUS

PDF

73.2 KB Created: 2021-03-23 02:20:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 44d416d5408aebafd699e9bb26234e7b SHA-1: 89144392dca4fc3df45d8d6760920dc911ad4f1f SHA-256: d8907a963255d932dd9676a6b26f8cdf21b819a30c902c1b0803e8c32a57c046
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://bologen.ru/award?keyword=adverbs+worksheets+for+grade+5+with+answers+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450259/normal_5fe85289dad9a.pdfIn PDF document text
    • https://vavixama.weebly.com/uploads/1/3/4/4/134471840/cb455576280329.pdfIn PDF document text
    • https://xexofukirusolim.weebly.com/uploads/1/3/4/8/134871283/jotikemitemu_vugoburi_jufijelimoru_nonumixa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475208/normal_5ff883c7d87e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413986/normal_5fe27d7cd43a0.pdfIn PDF document text
    • https://cdn.sqhk.co/zosiwikiw/jhhal1R/falling_sphere_viscometer.pdfIn PDF document text
    • http://disconto50.pro/tetavogabilegozujefudorc770.pdfIn PDF document text
    • https://cdn.sqhk.co/tosobulig/gdZWFuQ/lerivivozitedopudetowux.pdfIn PDF document text
    • https://jitebogegamoma.weebly.com/uploads/1/3/4/7/134761197/tarolosuxofok.pdfIn PDF document text
    • https://rewusimivizegan.weebly.com/uploads/1/3/4/5/134578415/pakisorerab.pdfIn PDF document text
    • https://kowagazobavov.weebly.com/uploads/1/3/0/8/130874359/0b3e00a1d.pdfIn PDF document text
    • http://silver35.ru/96132133851mtxwv.pdfIn PDF document text
    • https://zuwuroxiver.weebly.com/uploads/1/3/1/0/131070979/simokup-pifupidojon-wudivop.pdfIn PDF document text
    • https://cdn.sqhk.co/zivuputid/ghW4jcK/ronoxejow.pdfIn PDF document text
    • https://bukowomuwuritif.weebly.com/uploads/1/3/4/4/134443612/6789265.pdfIn PDF document text
    • https://cdn.sqhk.co/fapiwejagiz/Jggegc2/regidezopifuzunuba.pdfIn PDF document text
    • https://cdn.sqhk.co/tilafukefuwe/JiafDgf/voferigawixewux.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/e7eaddfd-b5ae-4d1b-b267-478816e78b22/62218378790.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00d0769a-436f-46ed-b5f3-c16f20c389d3/words_that_start_with_t_to_describe_someone_you_love.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2690fd1-5894-4752-9c29-dc27c06ce555/which_of_the_following_statements_is_true_about_organizing_a_multinational_company.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcf7f157-156a-400f-a857-a0f3d87a1e57/moon_river_piano_chords_in_c.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_off0000df6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6F 5740 bytes
SHA-256: de88a8a53782a408367517c12be55f80c0e5d2575cc4cf080f8d1ff6884dbaf5
font_01_sfnt_off0000f311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF311 10712 bytes
SHA-256: 6c77aee08cd63949151f601f1b8c0d517b1c2e88ba5aaeda6a04401aa6e82d6f