Malicious PDF — malware analysis report

Static analysis result for SHA-256 856ad5e26908f229…

MALICIOUS

PDF

54.4 KB Created: 2020-10-04 18:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 0f53eca8855d53e56f35df134907b967 SHA-1: 57bbae98d26e990958fca6c1d471500231db2237 SHA-256: 856ad5e26908f229829eda7e00feb9c33a3a36420db6788f9db7f52c4657fcd6
224 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not 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/strik?keyword=graupner+dachs+schnellboot In PDF document text
    • http://momolu.caravanoflore.com/uploads/1/3/1/3/131380767/xadedabeka_koliri_rilukov.pdfIn PDF document text
    • http://files.capitolhillhealingartscollective.com/uploads/1/3/2/8/132814848/433077.pdfIn PDF document text
    • http://files.advicetotheplayers.org/uploads/1/3/1/6/131636991/xevolapas.pdfIn PDF document text
    • http://files.williamlinwriter.com/uploads/1/3/1/6/131636914/494330ba.pdfIn PDF document text
    • http://wexixebu.newrencom.com/uploads/1/3/0/7/130740323/2516741.pdfIn PDF document text
    • http://files.willowhall.net/uploads/1/3/0/7/130738984/1386ee41dda.pdfIn PDF document text
    • http://werovigiw.heritagepreschoolmason.com/uploads/1/3/0/7/130776078/7921557.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/1119c40f-1b43-457f-b034-8467035f01d5/ralasarujopapalavu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbcd9e2a-2b79-4a8d-8f46-ea3d481014ed/54533376463.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/188d17bd-ae1f-4210-be2f-cda12e1a9491/51075745836.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c66519f-f34f-48b2-8393-bcab0bb7920c/wofobezexidozox.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_off00009670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9670 5332 bytes
SHA-256: 8eeebdc801db9c59208efac7eb0c8fcfce06633ac3dcd4c21949e03a8b6da2f3
font_01_sfnt_off0000a87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA87F 11064 bytes
SHA-256: 76eba901c2a0c37657d8e4242bb86c6e28216013120da18ef7764fbe7fbad9d9