Malicious PDF — malware analysis report

Static analysis result for SHA-256 af3cdd661201841e…

MALICIOUS

PDF

160.3 KB Created: 2021-03-22 15:57:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: af22c956a7cb411bf0e83f37d4d6baf2 SHA-1: 9d02b44e53c029aae7628817817c307f5d26a116 SHA-256: af3cdd661201841e5a24fe45d34837591899ba286d90b8702df16158ebeb34df
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by a machine learning classifier as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on disposable hosting, suggesting an attempt to manipulate search engine results or distribute malicious content. The document body, though heavily corrupted, contains text related to academic journals, which is likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ponafet.ru/strik?utm_term=international+journal+of+sports+and+exercise+medicine+impact+factor PDF link annotation
    • http://fajiwegoj.getenjoyment.net/86428442096.pdfIn PDF document text
    • http://suxoxaxowigab.scienceontheweb.net/94715406478.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485001/normal_600f8f9a8451d.pdfIn PDF document text
    • http://memaberenux.scienceontheweb.net/xomenoxepibuzeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424647/normal_603aa6775bd4a.pdfIn PDF document text
    • http://pewadulojuba.mypressonline.com/simuladores_ser_bachiller_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375528/normal_600187ba8f360.pdfIn PDF document text
    • http://kirakexig.mypressonline.com/86195208383.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450039/normal_5ffc336f53fef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369638/normal_5fc87246bb79a.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/c37b53de-9879-46cb-a3d4-4fdbd58deaf0/atem_tv_studio_setup.pdfIn PDF document text
    • http://kafuvaxuxele.epizy.com/fundamentals_of_biochemistry_donald_voet.pdfIn PDF document text
    • http://puzagivo.epizy.com/shimano_alfine_sl-s503_8-speed_shifter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d2edacb-92d3-4322-9934-76a4d767d217/rpg_maker_vx_ace_free_tilesets.pdfIn PDF document text
    • http://fopujokites.rf.gd/24659553978.pdfIn PDF document text
    • https://e4dd5bf8-bd13-43e3-b37b-9624b2564f03.filesusr.com/ugd/093416_268a6c58ff114e6d82a8009b152e7fd9.pdf?index=trueIn PDF document text
    • https://584dc5e1-4449-4bca-b3d9-d0e1fa08a972.filesusr.com/ugd/185caa_f69f9e7773dd4206b6ad9ca9702bf7da.pdf?index=trueIn PDF document text
    • http://sobikunukozi.rf.gd/setixelosijixo.pdfIn PDF document text
    • http://xeludum.rf.gd/amplitude_modulation_mcq.pdfIn PDF document text
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_d0ede69a12074a1fb624df99fd44c41b.pdf?index=trueIn PDF document text
    • http://bubewap.rf.gd/antibiotics_safe_in_pregnancy_guidelines.pdfIn PDF document text
    • https://2eda13a9-9e0f-47dd-bbfa-a9a5028a3314.filesusr.com/ugd/61c57f_bf0a0e308ed54e04a8ba227aa2ddb0b9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/15756918-1a3e-4324-837d-b54b3c94c2fd/harsh_mohan_pathology_book_for_dental_students.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed1dbd49-0942-451f-b8a9-bf5f1922aefe/record_date_for_interim_dividend_of_coal_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11764779-071d-4270-bb66-10301e77868a/27078297515.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_off00023294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23294 5380 bytes
SHA-256: 0decf4c61d0f3f9252501d945249917ffec799223a3c02bdf42912d7d2e99c5e
font_01_sfnt_off000244d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x244D8 16488 bytes
SHA-256: 7d338d4f96d95ae198234ffcc776cd9f49e5ed9f000e5b51d0f51efc816b8f4c