Malicious PDF — malware analysis report

Static analysis result for SHA-256 e161234766740a65…

MALICIOUS

PDF

72.8 KB Created: 2021-02-19 11:36:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 737b41334ce9cff6f741882c7930918f SHA-1: 75f80eebc7ff8405580d2506457d0be8f47f7e99 SHA-256: e161234766740a65d6b61a94542c9157dc10dd1544f5854c8dbe9c535ccb427e
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. It contains numerous external links, many pointing to disposable domains, suggesting an attempt to manipulate search engine rankings or redirect users to malicious content. The presence of a URL related to 'setting chrome search engines' in the document body indicates a lure to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/wix?keyword=setting+chrome+search+engines PDF link annotation
    • http://alisabor.design/54670567161s6p18.pdfIn PDF document text
    • http://hydraruzxpnew4af.exchange/dungeons_and_dragons_character_sheet_example6qxcx.pdfIn PDF document text
    • http://dorightunion.com/50038497458cui3x.pdfIn PDF document text
    • https://mavilefisubagar.weebly.com/uploads/1/3/1/6/131606233/mariru-wuzaginese-funanunax.pdfIn PDF document text
    • https://robavefozaxun.weebly.com/uploads/1/3/4/3/134379548/135ada808.pdfIn PDF document text
    • https://xaforegitada.weebly.com/uploads/1/3/1/4/131413040/7940476.pdfIn PDF document text
    • https://mediwamogapani.weebly.com/uploads/1/3/5/3/135318379/1204163.pdfIn PDF document text
    • https://ruwuzeget.weebly.com/uploads/1/3/4/7/134755445/0a6d5a2514d27.pdfIn PDF document text
    • https://cdn.sqhk.co/kebokeregim/ahcKwha/borazokanawokoxij.pdfIn PDF document text
    • https://mezepobavufu.weebly.com/uploads/1/3/4/7/134717124/memudifipal-bizarumim.pdfIn PDF document text
    • https://mogezisatizate.weebly.com/uploads/1/3/0/7/130775403/6611315.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pisironebininuw.rf.gd/how_heavy_is_a_round_bale_of_straw.pdfIn PDF document text
    • http://nilidax.epizy.com/what_ch_is_newsmax_on_optimum.pdfIn PDF document text
    • http://vaxasevon.epizy.com/1558002367.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_off0000e158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE158 5284 bytes
SHA-256: e774e54dbb46f047ee9fa43d26c28c4d9a4ef9635eb7f5a19b2067f7ef8b0835
font_01_sfnt_off0000f324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF324 10212 bytes
SHA-256: ef74fee01139bd92a337953c78e1cea8cd3e556dda22de7d0d7c149e7f3e4930

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