Malicious PDF — malware analysis report

Static analysis result for SHA-256 93b362f17fe55e61…

MALICIOUS

PDF

91.2 KB Created: 2021-02-14 14:16:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 9dbc26553a253b406649f712dbf9ae34 SHA-1: 70c3fc293524c86b80ec6afbecf2af8c529fcad3 SHA-256: 93b362f17fe55e61cec2af968435dd71c6e9f0285598f9f05abd38b5ef567ad7
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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 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://leonvi.ru/wix?keyword=osi+layer+model+vs+tcp%252Fip+model PDF link annotation
    • https://cdn.sqhk.co/posaleren/E5ggigI/56251545262.pdfIn PDF document text
    • http://jirekakeduvinij.22web.org/adaalat_episodes_for_mobile.pdfIn PDF document text
    • http://socialwave.me/estrutura_do_codigo_de_barras_ean_8xgwa1.pdfIn PDF document text
    • https://xibimitavidin.weebly.com/uploads/1/3/1/8/131871740/wulefelenifud.pdfIn PDF document text
    • http://crawlmqyu.space/96841297601uq55l.pdfIn PDF document text
    • https://varalege.weebly.com/uploads/1/3/0/7/130738576/4d33966f20.pdfIn PDF document text
    • https://rokerisokexojud.weebly.com/uploads/1/3/0/7/130738924/04f83ed.pdfIn PDF document text
    • http://zdorovie-vashe-vse.xyz/370370276114ddou.pdfIn PDF document text
    • https://mopebewugo.weebly.com/uploads/1/3/0/7/130776026/f42ee984d.pdfIn PDF document text
    • http://trelon.fun/xewavodoputexawosalagiposz2i0.pdfIn PDF document text
    • http://osthondroz.com/design_of_municipal_wastewater_treatment_plants6du1a.pdfIn PDF document text
    • https://munulokepopat.weebly.com/uploads/1/3/5/2/135297381/duwajisusewituguvek.pdfIn PDF document text
    • https://cdn.sqhk.co/zururodi/hfDFnhS/23448670670.pdfIn PDF document text
    • http://autobuff.xyz/24632020558u17m1.pdfIn PDF document text
    • https://cdn.sqhk.co/zekafomaze/IiahjBg/55275726682.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bowubibegejojop.rf.gd/xarosifolonuwezoju.pdfIn PDF document text
    • http://wupepiwora.rf.gd/holy_bible_niv_for_pc.pdfIn PDF document text
    • http://xelidamos.epizy.com/itv_guide_rugby.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_off00012963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12963 5444 bytes
SHA-256: d4aaa2cd5ad0aded4ce0e3017323cb9ef578f453ae18b037ca7eeef7ec3c7f0c
font_01_sfnt_off00013be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE1 10420 bytes
SHA-256: 1658de151fe59f341a7c7cbc4afcd1a0c10d5673e3cd5c98473c94acbb06c8f8

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