Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ad214f058b979cc…

MALICIOUS

PDF

96.8 KB Created: 2021-02-21 12:54:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 046d6ea3409773f1ad76e0ad1cf0ea7f SHA-1: ba01c1ab0938694e054fb3b51a403575d19d0a30 SHA-256: 7ad214f058b979ccc99ffe1d46398c34c60bb85fd262e3a2577b45bf9870c314
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm. ClamAV and ML classifiers identified this as a phishing or malicious PDF. The embedded URLs suggest an attempt to redirect users to potentially malicious or SEO-abused content.

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://baarspo.ru/wb?keyword=old%20bridge%20high%20school%20nj%20rating PDF link annotation
    • https://cdn.sqhk.co/kofosenolo/OcibhbR/bipez.pdfIn PDF document text
    • https://cdn.sqhk.co/zururodi/jfjf2e8/arcade_games_emulator_online.pdfIn PDF document text
    • https://cdn.sqhk.co/zexukobesu/YIihwyx/dragon_warrior_3.pdfIn PDF document text
    • https://cdn.sqhk.co/xaleteser/nyehahf/zatomaxawefejapugokun.pdfIn PDF document text
    • https://cdn.sqhk.co/sifujubagis/hfjfjc3/enerpac_cylinders_catalog.pdfIn PDF document text
    • http://damvglaz2.xyz/cant_connect_to_xbox_live_360_on_xbox_onej4xgw.pdfIn PDF document text
    • http://1xbet-registrat.site/radiant_energy_definition_and_examplesj5bno.pdfIn PDF document text
    • https://wujiwugamibi.weebly.com/uploads/1/3/1/3/131398142/5255690.pdfIn PDF document text
    • https://cdn.sqhk.co/pesenexur/dnVBjds/menhera_kun_and_friend_wastickerapps_en.pdfIn PDF document text
    • http://uaportal.site/sony_usb_turntable_softwarensvo7.pdfIn PDF document text
    • https://cdn.sqhk.co/tumowara/6fVsjcG/29627323408.pdfIn PDF document text
    • http://wordwild-store.com/80639996521ctezl.pdfIn PDF document text
    • https://lovevisop.weebly.com/uploads/1/3/1/4/131410094/6048346.pdfIn PDF document text
    • http://dovamemowiruz.iblogger.org/2018_climatescope_report.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
    • http://mixomexazuvoxod.rf.gd/35407475850.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E16 5232 bytes
SHA-256: 78db32f0b8da59cacedce05668117af5a489ffe410058858a2affc72f3748583
font_01_sfnt_off00013fcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FCC 12164 bytes
SHA-256: 73ca395b985a0393eb3de811a3c834be8963e67f92c00be6831bfc8cd3233c4a
font_02_sfnt_off000167e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167E5 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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