Malicious PDF — malware analysis report

Static analysis result for SHA-256 99eeaf097296cd55…

MALICIOUS

PDF

75.9 KB Created: 2021-03-28 18:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 3886808ed2850b13ee3ece49d4001b93 SHA-1: 19af226afd5274dd1828163e9fc1e27f455a9ddf SHA-256: 99eeaf097296cd550c3ef154e23a9806c877647ca6223a2c5b72fa90aa9f310e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to host malicious content. The presence of 'led keeper.exe application error' in the document body, combined with the ClamAV detection and ML classifier flagging, indicates a phishing or malware distribution attempt. The primary IOCs are the URLs associated with the link farm, which likely serve as download locations for malicious payloads.

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://pelibifir.ru/wix?keyword=led+keeper.exe+application+error PDF link annotation
    • http://loveantravel.xyz/luponiwatonimurujugi2iw0x.pdfIn PDF document text
    • https://tigewatujuw.weebly.com/uploads/1/3/0/7/130738543/e8acdf3da32.pdfIn PDF document text
    • https://cdn.sqhk.co/zixapegof/gcrHVhe/cable_cord_cutters_guide.pdfIn PDF document text
    • https://rulewosiziruzo.weebly.com/uploads/1/3/0/7/130739522/xabovufusitadefon.pdfIn PDF document text
    • http://banki-internetowe.com/hatha_yoga_asanas_benefitsq5pai.pdfIn PDF document text
    • https://netiwolofud.weebly.com/uploads/1/3/1/4/131438008/e90cafa3dcdb.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/csIhgkx/givopefopopotabezotujolu.pdfIn PDF document text
    • http://life-news.tech/667704437283b9j5.pdfIn PDF document text
    • https://cdn.sqhk.co/xufaribo/jjhhyhg/3124923626.pdfIn PDF document text
    • https://xoravali.weebly.com/uploads/1/3/0/7/130775395/7195182.pdfIn PDF document text
    • http://asia.kiwi/28346059706dj22x.pdfIn PDF document text
    • https://natumelazorog.weebly.com/uploads/1/3/4/7/134711419/noten.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_21a7ab9f6e7740749bae5b55981e6cc3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3454c808-2fe7-4702-bf78-b4419233f9d5/how_to_train_your_dragon_3_full_movie_on_youtube.pdfIn PDF document text
    • https://52468903-0e2d-47c5-babb-61e1d305d291.filesusr.com/ugd/32777b_6692a2d14dbb404c8409757485036a7e.pdf?index=trueIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_43f4fb767d4f424ea4c40dc2b8d3748d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbcd689b-c907-49f5-a310-1b5a3ef94683/bijupa.pdfIn PDF document text
    • https://e9abb47e-19e5-4ec2-9f3c-2aa4e6f2bf0a.filesusr.com/ugd/92be99_042903dd60e441adbebc229ce103a0d7.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF30 4780 bytes
SHA-256: 4f6a699bc631dd671eec0be7d99875cf5b4f765f89fddd7118efc148efa11fe0
font_01_sfnt_off0000ef7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7C 10868 bytes
SHA-256: a21e5f03ddbcdfca08c52ea10b1586170ec3d8685f475baf9b077735472414c1
font_02_sfnt_off0001149c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149C 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361