Malicious PDF — malware analysis report

Static analysis result for SHA-256 cab897bd30916341…

MALICIOUS

PDF

66.2 KB Created: 2021-02-11 14:21:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 61fb9924a7a5afc6020dd317f051f299 SHA-1: 862eb75b0b1e77b2b3b20948bbf411d6f57d5856 SHA-256: cab897bd309163412a3b5fe20f3047a01797fcdfff169362b8633b3b14d8b3ad
244 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=uw+madison+computer+science+ranking In PDF document text
    • https://cdn.sqhk.co/jogowijalaro/aZgejgv/small_business_plan_template_uk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426820/normal_5fe34750a92f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459780/normal_5fcd1a5d2f8c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462037/normal_6019c7ad6884b.pdfIn PDF document text
    • https://cdn.sqhk.co/mifodirula/jgvkheA/vidiq_apk_download_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/duloputemab/kjimjdz/tifawogo.pdfIn PDF document text
    • https://cdn.sqhk.co/lolumebitana/faJ2ic9/bomudalirarawowugowisam.pdfIn PDF document text
    • http://pro-komp-master.website/sozixinapukzvtrp.pdfIn PDF document text
    • http://scandisvet.ru/free_phonics_chart0u064.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409095/normal_5fdff3d446ab0.pdfIn PDF document text
    • https://cdn.sqhk.co/vituxezij/6Bihje0/skyrim_elder_scroll_id.pdfIn PDF document text
    • https://girosiwubu.weebly.com/uploads/1/3/0/7/130740458/nilofalofu.pdfIn PDF document text
    • https://mulofujuxemo.weebly.com/uploads/1/3/0/8/130874025/d6310d08d4480.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nakevoja/alif_baa_taa_audio_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/geometry_angles_worksheet_high_school.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_off0000c6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A2 5508 bytes
SHA-256: 7061b8631de301b9cb6d9b58b957de0b92eea6d110cbe0bc96c350c9eeebd6ea
font_01_sfnt_off0000d95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95D 10124 bytes
SHA-256: c9ede385099f3acebd14fdc469c9aa3193cc2fde66dbc38512e8c73c8dce21e2

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