Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b91d74905947d40…

MALICIOUS

PDF

82.5 KB Created: 2021-06-03 13:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 539e8b1ef7a20b12f8180397a166bddd SHA-1: d4d6ed04e9194e7def9d0da1bc0f30b71e492d4a SHA-256: 8b91d74905947d40d839541f9a283357df3b9d472aaf10581fd9aff7dc795c39
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://synerhu.ru/pbw?utm_term=dell+optiplex+790+cmos+battery+replacement PDF link annotation
    • https://busenijerebu.weebly.com/uploads/1/3/2/6/132695513/ce7d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421623/normal_60102ed9dafa6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421472/normal_5fedf8eb2d456.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415291/normal_604b11fe25a52.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487641/normal_5fccd84e02ba5.pdfIn PDF document text
    • https://tedifonag.weebly.com/uploads/1/3/1/1/131164063/sumoxurewo.pdfIn PDF document text
    • https://jotelozaji.weebly.com/uploads/1/3/4/4/134484012/kufaluxerodewezi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411935/normal_60b8678032466.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365634/normal_5fc94f562adde.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369330/normal_5fcc1c732ed7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465690/normal_600d11b1bc36b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kufujibumufa.pbworks.com/w/file/fetch/144412260/36910845917.pdfIn PDF document text
    • http://niluputevi.pbworks.com/f/52541325511.pdfIn PDF document text
    • http://refarumiba.pbworks.com/f/38815583187.pdfIn PDF document text
    • http://mapijakemifo.pbworks.com/w/file/fetch/144435510/19222452289.pdfIn PDF document text
    • http://mevuteled.pbworks.com/f/ver_talentos_ocultos_pelicula_completa_latino.pdfIn PDF document text
    • http://duziruromeja.pbworks.com/w/file/fetch/144489126/81460931821.pdfIn PDF document text
    • http://nilanom.pbworks.com/w/file/fetch/144428343/what_gemstones_are_found_in_washington_state.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD4 5764 bytes
SHA-256: 10bcc50900a4c47cef368e0ddfeb6fe311ab4f230da0100c0aaf8018a85111fc
font_01_sfnt_off0001006d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006D 11368 bytes
SHA-256: bfd7df37686e6ee68027b2f01ae1b020f1e748b0c81a373c1673b7a94d579e41
font_02_sfnt_off00012698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12698 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf

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