Malicious PDF — malware analysis report

Static analysis result for SHA-256 8935f29631ab6f0b…

MALICIOUS

PDF

79.7 KB Created: 2021-03-13 16:06:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: ce9482163331189a47975b9fcdd29396 SHA-1: 185eb66153e3f850bb78c2eebca42711480c2e45 SHA-256: 8935f29631ab6f0bfe36f9326aebff1f27cc9631df85912e143e2309135ad68c
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by both ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, appears to be a lure related to a user manual, likely to trick users into clicking the embedded malicious links.

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://gimoguvi.ru/wix?keyword=bissell+deep+clean+premier+pet+carpet+cleaner+user+manual PDF link annotation
    • https://nitejaxerovon.weebly.com/uploads/1/3/1/3/131379530/9672426.pdfIn PDF document text
    • https://mikigelovipu.weebly.com/uploads/1/3/4/3/134387596/jikeworimaserodaze.pdfIn PDF document text
    • https://mutakisutuw.weebly.com/uploads/1/3/4/7/134768563/mewarerifekoj.pdfIn PDF document text
    • https://xetomulezaze.weebly.com/uploads/1/3/0/9/130969551/reromewuxi.pdfIn PDF document text
    • http://mailedflkf.site/how_to_pick_up_a_dachshund_puppydnaos.pdfIn PDF document text
    • http://nudistoff.club/89632946056kfrvk.pdfIn PDF document text
    • http://lasns.fun/69500762291f5vbc.pdfIn PDF document text
    • https://gugajapu.weebly.com/uploads/1/3/5/3/135330564/xametezag-panepuzirakaxi-nonujuvupif-gagezali.pdfIn PDF document text
    • http://webmastervlad.ru/20718754927rhlcv.pdfIn PDF document text
    • http://gosugas.getenjoyment.net/troy_bilt_pony_riding_mower_oil_capacity.pdfIn PDF document text
    • http://xufulop.iblogger.org/36809684109.pdfIn PDF document text
    • https://libizegenumejav.weebly.com/uploads/1/3/0/7/130775388/mezapezuj.pdfIn PDF document text
    • http://xovuwowim.mypressonline.com/the_misfit_of_demon_king_academy_read_online_free.pdfIn PDF document text
    • http://nowefewafugaki.iblogger.org/intp_characters_tumblr.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://uploads.strikinglycdn.com/files/d899b375-249b-4364-afa2-3914becdb8f7/dajapoxabi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab520cdf-c8f5-4377-8e80-cecbcbb9752f/sibefudawemu.pdfIn PDF document text
    • http://lisotabisalak.epizy.com/jakexatagidusanurito.pdfIn PDF document text
    • http://fidikaxano.myartsonline.com/33519182643.pdfIn PDF document text
    • http://medelomozukomav.epizy.com/12961127739.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_off0000ec9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9F 5040 bytes
SHA-256: 81d38a6d34b64b7936d7f8d2e7bd0dac30c6037211bca7f169adf7de1d1cdded
font_01_sfnt_off0000fd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD98 10940 bytes
SHA-256: b39e447ece08beb33c077d1bb702ddba91225aa1cc2c74f3d20c4e19a6bd96d5
font_02_sfnt_off0001227c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227C 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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