Malicious PDF — malware analysis report

Static analysis result for SHA-256 36643fd225bc7407…

MALICIOUS

PDF

44.1 KB Created: 2020-07-08 12:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 8b881ec3d74e5f245cb52530d8d1bb88 SHA-1: 7f0852e97874d8078f9595149592cedc54f52a76 SHA-256: 36643fd225bc740748ee5aa7820561ccfcdf16879cff0117a5d4bc4e0a1abb15
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to a link farm designed to host numerous other PDFs. One of the primary links directs to a malicious redirector, likely intended to deliver a secondary payload. The document body text is minimal and appears to be a lure related to 'literature review on training and development'. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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://ttraff.cc/wb?keyword=literature%20review%20on%20training%20and%20development%20on%20employee%20performance%20pdf In PDF document text
    • http://files.microneedleregulatory.org/uploads/1/3/0/9/130969209/giwuvizalapunemaf.pdfIn PDF document text
    • http://files.alanbirtwistle.com/uploads/1/3/1/3/131383664/werox_xapedewero_bemidituziv_zurer.pdfIn PDF document text
    • http://files.didsburyjuniors.com/uploads/1/3/2/6/132681824/maxipupamekep.pdfIn PDF document text
    • http://files.eguastella.com/uploads/1/3/1/8/131871690/4656610.pdfIn PDF document text
    • http://files.david-jones-society.org/uploads/1/3/0/8/130814642/dixagululekivex_tekixomixe.pdfIn PDF document text
    • http://files.lochgoin.com/uploads/1/3/1/6/131607239/gutexal.pdfIn PDF document text
    • http://files.richlydwelling.com/uploads/1/3/1/4/131453316/lobusofajim.pdfIn PDF document text
    • http://files.monetwithacamera.com/uploads/1/3/0/8/130873830/zisiwub_sixed.pdfIn PDF document text
    • http://files.westech-rides.com/uploads/1/3/2/6/132695574/kakuxefozexavax_kajakapak_jofoxobavis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://jalejovit.files.wordpress.com/2020/06/xokilobufi.pdfIn PDF document text
    • https://gipugof.files.wordpress.com/2020/07/duluvo.pdfIn PDF document text
    • https://vunavurofexu.files.wordpress.com/2020/07/13538945952.pdfIn PDF document text
    • https://rabonakewajo.files.wordpress.com/2020/07/32748733134.pdfIn PDF document text
    • https://gamekupori.files.wordpress.com/2020/07/dirojofafamixiwe.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E41 5372 bytes
SHA-256: dff5fce49cc7d35643e750f6737d9aa311e66f9e6ff511c3edf4c7e4ea1d6bd0
font_01_sfnt_off0000808e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x808E 10284 bytes
SHA-256: a98c599c83a7053b1b5c83b2306262bda9c8b722b683f1664b50ded0a73fbba2

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