Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e4785a6e234928d…

MALICIOUS

PDF

73.9 KB Created: 2021-05-01 05:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 18713d3c3495183f7fb58caa3f6bcfd0 SHA-1: 2386caa2d80fbe5e5cf5df54119f6358fafa55dc SHA-256: 6e4785a6e234928dc20af85aab0532150ae30e42d51269e35b51c6fc03b6b8fc
66 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs, with one specifically targeting 'operations research analyst' and leading to a suspicious domain. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host numerous links on disposable domains, suggesting a phishing or malicious redirection scheme. While no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score point towards malicious intent, likely to redirect users to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://dugedepap.ru/strik?utm_term=operations+research+analyst PDF link annotation
    • http://biniwitovo.mywebcommunity.org/misekadoxaku.pdfIn PDF document text
    • http://suporefebakibur.mygamesonline.org/24710298557.pdfIn PDF document text
    • https://xosulokut.weebly.com/uploads/1/3/4/4/134466674/2720950.pdfIn PDF document text
    • https://gavozosalaz.weebly.com/uploads/1/3/1/1/131163920/fanavowewidit.pdfIn PDF document text
    • http://powerhdniy.space/nofizixigelujiganen3d8q.pdfIn PDF document text
    • http://fumigatoff.online/purchase_justification_letter_templatebv107.pdfIn PDF document text
    • https://wetarotener.weebly.com/uploads/1/3/0/8/130813606/32ca5.pdfIn PDF document text
    • http://sportita.fun/40727695640miapa.pdfIn PDF document text
    • http://indohealth365.online/73339276740fhbxp.pdfIn PDF document text
    • http://abanca-electronica.com/tipos_de_narradortoarw.pdfIn PDF document text
    • http://bufibinokurun.scienceontheweb.net/73279624663.pdfIn PDF document text
    • http://sedobepotorosi.22web.org/advanced_mathematical_concepts_precalculus_with_applications.pdfIn PDF document text
    • http://bitcoinlearningcentre.online/79382560065pxhm7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://laratimokusewa.rf.gd/munofutalaketo.pdfIn PDF document text
    • http://xefiposokupama.myartsonline.com/gisiriputobeliku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/101c3e48-98e8-49d2-951d-658c4918bc9d/magic_tree_house_haunted_castle_on_hallows_eve_reading_level.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80561de6-ef9d-4f8e-a137-f3ab66f61ef2/smart_watch_u80_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22beb78f-3da8-44a3-b164-e45999da191f/what_the_bible_says_about_drinking_wine.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_off0000e42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42C 5152 bytes
SHA-256: 5f6ef7e4e8dd8637a303af24a1dc538d790bed1cb600dfccd96685a34e5faaa7
font_01_sfnt_off0000f5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AE 10868 bytes
SHA-256: 02526199dedd8011dde8d27987cdbcba2de4a6ab2344224382ca7fbb88ab524a

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