Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c8982508ab29e66…

MALICIOUS

PDF

69.9 KB Created: 2021-03-14 18:23:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 7bf5b795fa46e4e507cf4d23f996b0ae SHA-1: 934f942d133254424b59c62b76c437d1446ace8d SHA-256: 4c8982508ab29e66a60749c123628230232fd18a0e9abafeed905381fc80237c
126 Risk Score

Malware Insights

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

The file is a PDF document flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains multiple embedded URLs, with 'https://zajinet.ru/wix?keyword=prairie+heights+healthcare' being a prominent example that appears to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to 'Prairie heights healthcare'. The presence of numerous external URIs and the overall structure indicate an attempt to direct the user to potentially malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/wix?keyword=prairie+heights+healthcare PDF link annotation
    • http://mail-autoscout24.net/80479435709ky7z6.pdfIn PDF document text
    • http://chaptejvxz.fun/gikerabesakzh6q.pdfIn PDF document text
    • http://nosinoski.shop/314069551otdcq.pdfIn PDF document text
    • http://ueuniti.xyz/24466399632ln6wp.pdfIn PDF document text
    • http://rubyshup.space/flexconnect_local_switching_vlan_mappingy34v7.pdfIn PDF document text
    • http://teenagetutor.online/learn_write_chinese_app_androidx8rdk.pdfIn PDF document text
    • http://expressvpn.store/65490466399lejnz.pdfIn PDF document text
    • http://bossyonlinex.com/852816861336nl7.pdfIn PDF document text
    • http://lavka-karamel.ru/craftsman_yt3000_42_partsly55j.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_275425bcb1f848e58f7167f43a81f98f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/aleppo_codex.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/88859749658.pdfIn PDF document text
    • https://83f018a0-8e49-44f0-b57e-805e464a5f06.filesusr.com/ugd/10a4aa_5824de473e324d70a7b35467d2692b52.pdf?index=trueIn PDF document text
    • https://1eba3b37-3dce-45e8-aa15-e51a58efc0fe.filesusr.com/ugd/89e37c_df3a58709f9847e3a5e92fb3bdf8737e.pdf?index=trueIn PDF document text
    • https://28ae28a3-27cc-4d38-be83-0de1f6925f83.filesusr.com/ugd/454016_8208bc14091640d99f74ecfefeff8766.pdf?index=trueIn PDF document text
    • https://f9a132f0-acc9-4761-b7d8-38025aedd849.filesusr.com/ugd/5c71d6_ed2891e6dc554c549a06abddab780466.pdf?index=trueIn PDF document text
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_fbf0df9d8ec94063b331efb6bca6622e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/mibevavufelig.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/kowasakaraxifibagofatabot.pdfIn PDF document text
    • https://16012499-1299-48b0-8cdd-5f23a7749958.filesusr.com/ugd/fafc38_952eef71817847d7b8f77cec90dbf860.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62C 5060 bytes
SHA-256: 846abe6b3100013ed9b8e8ab0caace42ff4dd4eb426f65973b25b0c6562098f5
font_01_sfnt_off0000e760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE760 10384 bytes
SHA-256: cb7790d805be94753c8d6100e87cc60fa7cf4be252c2f53d9619badfed3e1ae4

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