Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef91d1c41a7742b6…

MALICIOUS

PDF

72.3 KB Created: 2021-02-22 23:33:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5f10b7456386c883a48bfea482969050 SHA-1: 9726635cefc9ade33dc271d5c4cd373ca3eea7fa SHA-256: ef91d1c41a7742b61234587106c5c5dd7b6961d2c688a7de093ada1103ef2413
186 Risk Score

Malware Insights

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

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 0.9997

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://leonvi.ru/wix?keyword=ohio+county+codes+sales+tax PDF link annotation
    • https://marikiwow.weebly.com/uploads/1/3/1/3/131379510/boreziriwesuku_soxagogu_muvuvufazidadu_pazuwonalitul.pdfIn PDF document text
    • https://kuritemu.weebly.com/uploads/1/3/1/3/131383398/bojod.pdfIn PDF document text
    • https://vetaneje.weebly.com/uploads/1/3/4/7/134729364/1570534.pdfIn PDF document text
    • https://suzabotofofetab.weebly.com/uploads/1/3/4/7/134739937/metununubuzig-viwisabikukasi-lesokuzoba-gatatebijasa.pdfIn PDF document text
    • https://cdn.sqhk.co/fumamimed/hejfK5j/wujiwixixivutixet.pdfIn PDF document text
    • https://muvesajaduxu.weebly.com/uploads/1/3/4/0/134012660/zazusujokedaze.pdfIn PDF document text
    • https://wazurewimi.weebly.com/uploads/1/3/4/5/134598950/70b821e8529f.pdfIn PDF document text
    • https://tewedarutomos.weebly.com/uploads/1/3/2/3/132302993/5305929.pdfIn PDF document text
    • https://cdn.sqhk.co/xexisini/uhfotE7/vejuvurejilowezogaza.pdfIn PDF document text
    • https://derigibi.weebly.com/uploads/1/3/4/4/134447264/mafig-rumalapetama-xeliromot-wivujivakipep.pdfIn PDF document text
    • https://cdn.sqhk.co/pevelefotuve/fXhhhjY/free_download_rally_racer_dirt_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/zogowefu/if9hhcZ/79401591953.pdfIn PDF document text
    • https://cdn.sqhk.co/naxupowu/JidBihw/29513958580.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/bajapovogam/battlefront_ii_inferno_squad.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/angular_formarray_patchvalue_example.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/10764285237.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC1 5128 bytes
SHA-256: f6ec749ff5c7e3497e56b4fef2e3659c3c4cb2e7f9e82871f74b4ef8fa9efa20
font_01_sfnt_off0000f03e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03E 10660 bytes
SHA-256: d9cb2d7ab175f800f862407cac4cc8f05977f0be7781d7ea0ba9e9ff1c951a0b

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