Malicious PDF — malware analysis report

Static analysis result for SHA-256 129a31fe70531d2a…

MALICIOUS

PDF

71.2 KB Created: 2021-02-17 14:40:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f807fd0a2c92818ef35e45688c296d5e SHA-1: 23b466521655d5f1bd0307cdae84dcd206ad243d SHA-256: 129a31fe70531d2a69a9399994026ec8651b78d227292ca7914e3b2021f88c7f
186 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of a large number of external links, including one pointing to maypoin.ru, suggests a phishing or link-farming attack. Although no scripts were explicitly extracted, the PDF structure and link farm indicate an attempt to redirect users to malicious content.

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://maypoin.ru/123?utm_term=safe+church+policy PDF link annotation
    • https://totijavefukaja.weebly.com/uploads/1/3/4/7/134705726/muruforimega.pdfIn PDF document text
    • https://tunuwadubozowe.weebly.com/uploads/1/3/4/3/134363043/wikakukikekubaposu.pdfIn PDF document text
    • http://mifvideo.space/331478127741ih6z.pdfIn PDF document text
    • https://xatuguje.weebly.com/uploads/1/3/1/8/131856293/vudumevu_malejowefexa_wupeguwoti.pdfIn PDF document text
    • https://dejutuzalusabi.weebly.com/uploads/1/3/4/8/134869317/zuluzesifa-vekijig-fazosisixesa.pdfIn PDF document text
    • https://nilesezijifata.weebly.com/uploads/1/3/4/8/134885493/5235674.pdfIn PDF document text
    • http://hookup154.site/the_visit_playulnv5.pdfIn PDF document text
    • https://zugasunisozabij.weebly.com/uploads/1/3/4/7/134759734/11cb2a0f1f7d1.pdfIn PDF document text
    • http://wisecreditscore.info/childish_gambino_3005m44ge.pdfIn PDF document text
    • http://drnextact.xyz/rupinder_gandhi_2_hd_moviez4osb.pdfIn PDF document text
    • http://gooddevice-online.com/zaliviwei5.pdfIn PDF document text
    • https://xuxulavadimuxa.weebly.com/uploads/1/3/4/2/134234789/1070654.pdfIn PDF document text
    • http://findssldz.xyz/punjabi_movie_ardaas_freexxlv7.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/wiremeresegikon/16496224162.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/kigogununarevisarip.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_off0000db4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4E 5132 bytes
SHA-256: 51351fd5aa27491eaf1f0fe9166e4c298333da059f15b17bdf19f6d379e741a5
font_01_sfnt_off0000ecce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCE 10532 bytes
SHA-256: a2bea888fc7af0dc3405bb92e5a85a691357dbc87d435803831971e8b91a500f

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