Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a62d235742735e…

MALICIOUS

PDF

69.8 KB Created: 2021-04-06 05:43:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3802f04782de49cc89edf4c79df61e52 SHA-1: f23ea608e8b1eb7989e26fef601db3f82b0044ca SHA-256: 13a62d235742735e81b1ef92c04f325259ecc35d380dd006ffab7c29c38f2ca8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://jacksth.ru/123?utm_term=pokemon+emerald+rom+gba+android PDF link annotation
    • https://naruvemekojesez.weebly.com/uploads/1/3/4/6/134685524/movatozimofojes_xadibomi_fuwajasexer_ripifisoxe.pdfIn PDF document text
    • http://dombitarf.ru/sk_borhanuddin_college_admission_informationn59u7.pdfIn PDF document text
    • https://vesokawewewavi.weebly.com/uploads/1/3/1/3/131382886/9adbb.pdfIn PDF document text
    • http://blockingscenery.com/31047652529uvz9k.pdfIn PDF document text
    • http://axecheat8.xyz/riwijedefodetev96cs2.pdfIn PDF document text
    • http://korecos.ru/734968960430jkn1.pdfIn PDF document text
    • https://cdn.sqhk.co/suwojixuwebi/dLGjdgh/62013883709.pdfIn PDF document text
    • http://buybritishcat.com/85950862767lc0ix.pdfIn PDF document text
    • http://legalvictory.group/scag_freedom_z_vs_liberty_z86p30.pdfIn PDF document text
    • http://lynciguest.com/90963883124y9vff.pdfIn PDF document text
    • http://presalon.xyz/39069846141osncx.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/ahcgeif/unicorn_photo_booth_template.pdfIn PDF document text
    • http://erogancolumbia.site/46412550393fh2y0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kaxukok/tomifovolaxam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0404ee84-089b-4d51-80d4-1677e3efc0a5/geronimo_stilton_characters_wiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f6b1290-37d0-4b2a-a01f-5ce7d7b581ac/26512428392.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/9123538490.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d396763-77db-4a26-8ccb-25ede4dbc5bd/i_am_the_entertainer_billy_joel_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/how_to_fit_a_digital_thermostat.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_off0000c9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9ED 5172 bytes
SHA-256: 8c879251146a1d46a2afd3c59dbf77c292517211344755bbe1ad198f9ea47d19
font_01_sfnt_off0000db71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB71 14120 bytes
SHA-256: abdf4c59671ee1fc44325e97201dc22b000f2817db47896fdca19d2e6758edad

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