Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a28ce4e1895719…

MALICIOUS

PDF

73.8 KB Created: 2021-03-06 01:53:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 006316846a0fb18222555942d4c3e015 SHA-1: 1696489c472f43d9fd92242584d8e74f12a42d65 SHA-256: a8a28ce4e1895719baf313311ccd7e5265bf86b3199d355b24ea68bb435e4159
126 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ML models and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs, with a primary one pointing to 'pelibifir.ru', suggesting a lure to a potentially malicious website. The document's structure and embedded links indicate it functions as a link farm designed to redirect users, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://pelibifir.ru/wb?keyword=how%20to%20replace%20carburetor%20on%20briggs%20and%20stratton%20snowblower PDF link annotation
    • https://cdn.sqhk.co/feketukadoz/aDlgjhb/79223193844.pdfIn PDF document text
    • https://cdn.sqhk.co/jenotonolo/UihOmja/build_battle_minecraft_server_pe.pdfIn PDF document text
    • http://begemotiks.space/jaglany_detoks_przepisy6rsba.pdfIn PDF document text
    • http://leomannapov.com/3863646186970hc4.pdfIn PDF document text
    • http://mon-cmso.best/what_is_a_canticle2y3s9.pdfIn PDF document text
    • http://begdas.space/how_to_draw_with_oil_pastels_easy_for_beginnersmwtjo.pdfIn PDF document text
    • http://harkateine.fun/48598567791n8hx8.pdfIn PDF document text
    • http://clubstore.pro/battletech_gameplay_2020tnpj7.pdfIn PDF document text
    • http://gopubewigofopa.iblogger.org/69319808909.pdfIn PDF document text
    • http://evromotors.net/synonyms_worksheets_for_grade_51t20e.pdfIn PDF document text
    • https://cdn.sqhk.co/mamidusidozu/6y4jhii/81986330796.pdfIn PDF document text
    • http://pimunipimikuvaj.iblogger.org/poulan_18_inch_wild_thing_chainsaw_parts.pdfIn PDF document text
    • http://venira.su/jenefimokezowosasarolbh89e.pdfIn PDF document text
    • http://reznitskygallery.com/32900624071hhak.pdfIn PDF document text
    • http://byseles.xyz/95489176006bb5ev.pdfIn PDF document text
    • http://obuv-kozha.ru/19814910574xgizd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bad3f395-1638-4667-b349-d6f934eeab49.filesusr.com/ugd/ed2d23_f12a822b9d5f4e91bf4901247adcae25.pdf?index=trueIn PDF document text
    • https://4a39c6c9-989b-4d11-b2d8-cc0becc7f193.filesusr.com/ugd/ef0078_adcbfbf22d26470db54d1133045671ce.pdf?index=trueIn PDF document text
    • https://f72b89be-0fa6-41ee-8162-331329ef78ce.filesusr.com/ugd/95089d_da9e05ac81e3474c8d51107cf5363b9c.pdf?index=trueIn PDF document text
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_7132567c0950487685d9bcddb9b36504.pdf?index=trueIn PDF document text
    • http://zusunikumejimet.rf.gd/what_is_grand_staircase_escalante_national_monument.pdfIn PDF document text
    • http://bemuvubovewe.epizy.com/nefijerefogemefoxokovafo.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_off0000e155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE155 5436 bytes
SHA-256: 05e2f42d9214e41164f7ee9edced1c05f8848d44fefe1b4698b364a15416190e
font_01_sfnt_off0000f3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E1 10964 bytes
SHA-256: 806dfae838d123cf7819af324fcf8ad1f783fcc8b4056d02b7c787837f00e86b

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