Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a813cec67a56d7c…

MALICIOUS

PDF

71.4 KB Created: 2021-02-14 12:41:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: f4438a7c452b28eb4324a54622e29aff SHA-1: 1d584a54ebbe63de81cde4ea30f4a29ef09d1cad SHA-256: 4a813cec67a56d7c6e5c81b0e28b2be2b1f8e426499360ed40ae2292356811de
244 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=ap+us+history+crash+course+2019+pdf In PDF document text
    • https://gigemapafinul.weebly.com/uploads/1/3/1/3/131398374/a9431882db3e442.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445731/normal_600299a7ce148.pdfIn PDF document text
    • https://cdn.sqhk.co/bulunazi/mshhhhe/digi_cluj_plata_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382631/normal_6013b4101d7fa.pdfIn PDF document text
    • http://uablog.site/30283241327xpkf1.pdfIn PDF document text
    • http://covidcapsule.world/71608686966yik2s.pdfIn PDF document text
    • https://cdn.sqhk.co/rizonozugaj/egjgQhh/how_do_you_write_a_business_plan_example.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495681/normal_5ffd1ff4ba2ff.pdfIn PDF document text
    • https://rizomoxus.weebly.com/uploads/1/3/4/5/134589692/7545767.pdfIn PDF document text
    • https://bisudika.weebly.com/uploads/1/3/4/3/134366448/totazewo-gunekugemenu-naleweni.pdfIn PDF document text
    • https://nilowebun.weebly.com/uploads/1/3/4/7/134751503/larin_jejeni.pdfIn PDF document text
    • https://cdn.sqhk.co/tavaxikanabu/geEqihj/evil_family_escape_scary_creepy_horror_game_online.pdfIn PDF document text
    • https://gapikedezasede.weebly.com/uploads/1/3/1/4/131438622/8834287.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94D 5784 bytes
SHA-256: 26d3dc50a35ebe0c76df67c51c57a7931e66169c2ef699e51973ca5862c34748
font_01_sfnt_off0000ed0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0E 10572 bytes
SHA-256: 4c4a889fda2dbe3f2944bf6ce69c2ea033531b6f677a5aad8aca84b61c8c0310

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