Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a931d824adcc1d…

MALICIOUS

PDF

85.6 KB Created: 2021-03-27 12:01:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4fab0d2342e48a0c3bc6b5235bcecd88 SHA-1: 5b1edee53a7e0aa06448ad6c84f46008902ecb22 SHA-256: 13a931d824adcc1dcaf66d1494d0cd6666faf466fdff6e9bbad3f1660064c36a
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://maypoin.ru/award?keyword=beginner+vocabulary+esl+pdf PDF link annotation
    • http://zudepogumo.medianewsonline.com/libro_caballo_de_troya_5_gratis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462351/normal_601f226a77f90.pdfIn PDF document text
    • http://jivusibofonefud.mygamesonline.org/autobiography_file.pdfIn PDF document text
    • https://namoturobiro.weebly.com/uploads/1/3/0/7/130739164/demunivigin-nananatigul.pdfIn PDF document text
    • http://megatorg.ru/ethiopian_school_system1duwi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371005/normal_5fda1e7181e5d.pdfIn PDF document text
    • https://mijezuri.weebly.com/uploads/1/3/0/9/130969422/puwogexudonopi-jepevoxodizivi-gojimazu.pdfIn PDF document text
    • http://sigisuzuk.getenjoyment.net/robada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446650/normal_605ee91aaa076.pdfIn PDF document text
    • http://graatorama.fun/77382904415uxn11.pdfIn PDF document text
    • http://pedrons.space/fumerolaxulevawol0awr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403271/normal_5fe4363443fa0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404133/normal_5fcb47267ad67.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb8a731f-1c22-4eee-a377-7ee1774dab72/toshiba_satellite_l755_charging_port.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d7cbb28-726a-4e06-89fd-6d6e43c444a4/xedanizowudefosusat.pdfIn PDF document text
    • http://gizixaxeviduf.myartsonline.com/45175969559.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10c8bfe2-d16e-49a5-8ed1-8b4cd481aab8/zemamigegojuzazetaxaxa.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/grupos_de_risco_covid_oms.pdfIn PDF document text
    • https://s3.amazonaws.com/wogikokuzotaxa/jepubetoj.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_off0000f5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E6 7524 bytes
SHA-256: f27a30d704f341842b6f9e40e44c010466fb0d9875f86ccd66810b2feb42bc58
font_01_sfnt_off00010f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F48 5676 bytes
SHA-256: 3404d6eb14dd74df3572990b996285142ae513d18f5a8aff9974fff8e0431e5a
font_02_sfnt_off000122b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B8 12036 bytes
SHA-256: 14ed562065631247ecb14ff74b85274ae2ae8a885a1c8615779bfdf1d11d9e9b

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