Malicious PDF — malware analysis report

Static analysis result for SHA-256 10a56a1e6316ab63…

MALICIOUS

PDF

77.8 KB Created: 2021-03-10 01:00:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 57711a5689a1c504433b54198dace19d SHA-1: 5f2cb73a0a43223211f8c7b34f578a482f479b53 SHA-256: 10a56a1e6316ab631a87b2b93f279bf03216bf8f6f505fea8fa62a7925cc316b
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://jumiwimov.ru/award?keyword=regression+and+correlation+analysis+in+statistics+pdf PDF link annotation
    • https://cdn.sqhk.co/nedupugifuka/7p1jdi6/zombie_defense_tycoon_roblox.pdfIn PDF document text
    • https://cdn.sqhk.co/xibetevoxaj/enhbyjd/68651113639.pdfIn PDF document text
    • https://nalokulomegeze.weebly.com/uploads/1/3/4/7/134758193/b78ca499a321.pdfIn PDF document text
    • https://mavekajokirusap.weebly.com/uploads/1/3/1/4/131437454/9377165.pdfIn PDF document text
    • https://fawiwusum.weebly.com/uploads/1/3/1/6/131637021/pojesugi.pdfIn PDF document text
    • https://cdn.sqhk.co/bilexodofose/0W3hif6/ted_cruz_education_bill.pdfIn PDF document text
    • https://cdn.sqhk.co/javukapegami/3hjghjh/duzerepuboburuke.pdfIn PDF document text
    • https://cdn.sqhk.co/bazexolareja/g45As3N/bedoyecta_tri_uses.pdfIn PDF document text
    • https://cdn.sqhk.co/woxemumi/j7iijdk/rush_limbaugh_health_update_september_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/tefulobesa/b9gdhgy/diced_pineapples_fabolous.pdfIn PDF document text
    • https://kenemujawov.weebly.com/uploads/1/3/4/6/134645985/pifunavivazipo-nufazivolulo.pdfIn PDF document text
    • https://mukozuzaze.weebly.com/uploads/1/3/4/2/134265885/44a761f141.pdfIn PDF document text
    • https://jilarikogezinuv.weebly.com/uploads/1/3/0/9/130969280/99db4a84dd7.pdfIn PDF document text
    • https://cdn.sqhk.co/kogewole/idIjfPp/draw_it_io.pdfIn PDF document text
    • https://sivevaredewiw.weebly.com/uploads/1/3/4/4/134464028/82aaf0ad.pdfIn PDF document text
    • https://cdn.sqhk.co/rorajakura/jdiiTJs/22849861177.pdfIn PDF document text
    • https://cdn.sqhk.co/zoluwumenad/gjc3zgc/67423517799.pdfIn PDF document text
    • https://lifitexuga.weebly.com/uploads/1/3/4/3/134356919/4a097c7365fe.pdfIn PDF document text
    • http://fibakigefejep.66ghz.com/definicion_reformas_borbonicas_wikipedia.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vijanemafe.rf.gd/48926932410.pdfIn PDF document text
    • http://fomobiwudaz.rf.gd/noxagilalelitoginegokaduk.pdfIn PDF document text
    • http://gobozukelawi.epizy.com/bavaxeme.pdfIn PDF document text
    • http://kupejesipagizup.rf.gd/katukesemujiwikukiwatoxug.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_off0000f431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF431 5432 bytes
SHA-256: 3c503f0e8a3d39029a51384d7edb67ebd6a8b9c0a24fce889b7bde4b8aafb02d
font_01_sfnt_off000106d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D1 10196 bytes
SHA-256: 787a3ffbf480ce2da670c49d7fd7172dcb9a2143633fb78345eea7ef776c12e6

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