Malicious PDF — malware analysis report

Static analysis result for SHA-256 a98a6b93304820d7…

MALICIOUS

PDF

83.4 KB Created: 2021-04-03 21:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0302e66d162a21089f5bb2ccb89a594 SHA-1: 7fcb7461f35aeb9212061151a068cbc95b365e14 SHA-256: a98a6b93304820d7fde195e1c90db0dd81954c2ca2448a4d692a1676bf6aca84
126 Risk Score

Malware Insights

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

This PDF document was flagged by an ML classifier as malicious. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. One of the primary URLs, 'https://nipisod.ru/wix?keyword=minn+kota+copilot+manual', appears to be a keyword-based redirect. While no scripts were explicitly extracted, the PDF structure and extensive link farm indicate a malicious intent to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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://nipisod.ru/wix?keyword=minn+kota+copilot+manual
    • https://static.s123-cdn-static.com/uploads/4425255/normal_5ff295bed9c31.pdf
    • https://guvefivilemu.weebly.com/uploads/1/3/4/3/134397682/4fe2e99840df4.pdf
    • https://kufoxigokutef.weebly.com/uploads/1/3/1/8/131856815/nepefet.pdf
    • https://tirilume.weebly.com/uploads/1/3/4/8/134886795/49ca5f5.pdf
    • https://cdn-cms.f-static.net/uploads/4484610/normal_603b37b308113.pdf
    • https://cdn-cms.f-static.net/uploads/4492253/normal_605883a148729.pdf
    • http://dasuwupozu.22web.org/astm_a536_free_download.pdf
    • https://static.s123-cdn-static.com/uploads/4413714/normal_5ff3e81b5e5f8.pdf
    • https://cdn-cms.f-static.net/uploads/4385869/normal_60680310df6ec.pdf
    • https://vawuwoteb.weebly.com/uploads/1/3/0/9/130969488/sowajonu.pdf
    • http://xibiselid.medianewsonline.com/voxifevibodepivo.pdf
    • https://munefetuwavebif.weebly.com/uploads/1/3/2/6/132683017/2896706.pdf
    • https://faluwizux.weebly.com/uploads/1/3/4/3/134372305/9ace5ed9d.pdf
    • https://xorexataziz.weebly.com/uploads/1/3/4/4/134496469/8681743.pdf
    • http://popisazono.getenjoyment.net/sikejuwodovemokate.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://misanedajog.myartsonline.com/libro_breviario_de_los_politicos.pdf
    • http://degevojorak.myartsonline.com/cards_against_muggles.pdf
    • http://fagufobukabovu.epizy.com/8229484178.pdf
    • http://pevogikuxupeja.onlinewebshop.net/aprender_sueco_portugus.pdf
    • https://s3.amazonaws.com/tinezedu/bharat_full_songs_ming.pdf
    • https://s3.amazonaws.com/wewuxuviwar/discrete_uniform_probability_distribution_examples.pdf
    • https://s3.amazonaws.com/votawawo/dead_kennedys_chickenshit_conformist_tab.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd23.bin
0725a5f341a0e04892dc1d025a4b7b8f166d51863bdc9613d8eae50fe6613d3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD23 4640 bytes
font_01_sfnt_off00010cd0.bin
fd64480ae93a5c6da55faee8fa86f7d6146eff1b74315a602090fc6370e1b98b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD0 11044 bytes
font_02_sfnt_off0001323c.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1323C 4324 bytes

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