Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d88f536fa33835…

MALICIOUS

PDF

65.3 KB Created: 2020-11-14 16:55:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: b6ae41f8472f13bee73236e5aee5fdba SHA-1: 7de616c5c01386e77f9dd8167a28b818c8267110 SHA-256: a8d88f536fa33835b143cc09ce69bc95bb9eb5d9e0852f1091cf42546873b25d
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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://cctraff.ru/aws?utm_term=boxer+puppy+images In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380076/normal_5f8f94843e0a8.pdfIn PDF document text
    • https://dilukali.weebly.com/uploads/1/3/4/5/134584555/8535533e0.pdfIn PDF document text
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/mawipubowibetin_pelesibatomo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416935/normal_5fa3e53946bf6.pdfIn PDF document text
    • https://taruzabob.weebly.com/uploads/1/3/4/4/134493447/tuxolofuwus-galewu-dexulivu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380707/normal_5fa56b3083fc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378171/normal_5f91c4116a74a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449402/normal_5fa23dc64d42d.pdfIn PDF document text
    • https://tixusevonatafix.weebly.com/uploads/1/3/4/6/134611731/0c098fb3dc94.pdfIn PDF document text
    • https://ruwadegefanum.weebly.com/uploads/1/3/4/1/134108857/ec37ca8777294.pdfIn PDF document text
    • https://vutizimowunofe.weebly.com/uploads/1/3/4/3/134354130/11daed2852.pdfIn PDF document text
    • https://rigitugatelimo.weebly.com/uploads/1/3/4/1/134131632/ritojiwaro.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/vawoginele/14863646259.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/zumezuvuze.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_off0000c31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC31D 5328 bytes
SHA-256: f939c59abbef072c9f3b472c885633e9521d3d454dee1b4163055fee8c708603
font_01_sfnt_off0000d538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD538 10496 bytes
SHA-256: d063aa8dfb86de5aebe490375bc16f698a397db6524f5ea65384ff9a0922b5d3