Malicious PDF — malware analysis report

Static analysis result for SHA-256 7781cab9859b975e…

MALICIOUS

PDF

108.2 KB Created: 2021-01-29 12:14:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 9a14adad76de9635e0917c99d99902dd SHA-1: eb483d2042e4402efe223e6870a0abb4f24c873d SHA-256: 7781cab9859b975ead586f015e65df2d4d369321bca0a33ad9df654ae9288ede
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified by heuristics as a link farm on disposable hosting. ML classification and ClamAV detection strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and embedded URI suggest it is intended to redirect users to a malicious site for credential harvesting or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/123?utm_term=katsute+kami+datta+kemono-tachi PDF link annotation
    • https://rotarivinevi.weebly.com/uploads/1/3/4/5/134599250/zenogevijozilamavaz.pdfIn PDF document text
    • https://larunigilusevim.weebly.com/uploads/1/3/5/3/135320243/8844e20.pdfIn PDF document text
    • http://ita-fitness.fun/sumetowategoxasyqs78.pdfIn PDF document text
    • http://dvigatel.guru/96415502279y8rnf.pdfIn PDF document text
    • http://xazamobi.66ghz.com/boney_m_rasputin_instrumental_free.pdfIn PDF document text
    • http://lazadacostumercenter.com/momogusbg7ti.pdfIn PDF document text
    • http://dogopanasukodum.22web.org/sessions_de_formation_traduction_en_anglais.pdfIn PDF document text
    • http://site-shop.xyz/alter_ego_methode_de_francais_a12lmpb.pdfIn PDF document text
    • http://info-pages.ru/17368986445z1mqh.pdfIn PDF document text
    • https://zafasasuk.weebly.com/uploads/1/3/4/7/134713251/mikizumajumadib.pdfIn PDF document text
    • http://pedron.fun/48779609641aqqaf.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/geradi/kali_linux_boot_usb.pdfIn PDF document text
    • http://natadomemorad.epizy.com/background_hd_pics.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/32759915809.pdfIn PDF document text
    • http://kijolitenelofon.epizy.com/ritulizugara.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/45235483356.pdfIn PDF document text
    • https://s3.amazonaws.com/ditiruz/38280711930.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00016dbd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16DBD 29112 bytes
SHA-256: f11746aae6083ee31562c55bb661e7269c270850ccfd9eb9374b5e0575eb38c0
font_00_sfnt_off00010ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF9 11524 bytes
SHA-256: b2311fb6197ad8c0240cc63dee440f566a360c64a411592a9ef6a4266991f365
font_01_sfnt_off00013516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13516 5116 bytes
SHA-256: 92f89d087eb795c27eb434d0d4123c3393daf32c8213707c63aac24bd727951f
font_02_sfnt_off00014662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14662 11920 bytes
SHA-256: 88053a4fe43c499f9ec9141a112d1626cd20c64dd0ed20215f3a5a42b6baad59

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