Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a15abac6b03daea…

MALICIOUS

PDF

74.7 KB Created: 2021-03-25 13:25:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 7245b7b56dbf516232d7afc3c52f46de SHA-1: 35603f2c3ffc093f08c2b0408140825e6e9256f3 SHA-256: 3a15abac6b03daead3a414d0101bf87a33d07f63a82688b10205d88e9580dc4c
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The document body, though heavily corrupted, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create SEO-optimized PDFs for link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://dugedepap.ru/award?keyword=contrato+de+confidencialidad+modelo+pdf PDF link annotation
    • https://cdn.sqhk.co/wirowanorax/ic7Djbn/android_messages_for_web_desktop_app.pdfIn PDF document text
    • https://cdn.sqhk.co/zitiwofiru/a8ichiI/gmail_app_android_imap.pdfIn PDF document text
    • https://wotewaga.weebly.com/uploads/1/3/4/6/134615540/juzapavoregix.pdfIn PDF document text
    • http://rezumitisud.mygamesonline.org/kugef.pdfIn PDF document text
    • http://pawomodom.medianewsonline.com/gopinan.pdfIn PDF document text
    • https://desofaris.weebly.com/uploads/1/3/4/6/134612921/migudo.pdfIn PDF document text
    • https://zixaderal.weebly.com/uploads/1/3/0/9/130969504/xotodolazipudutuwaj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467950/normal_5fed067edb870.pdfIn PDF document text
    • http://kojewotezigu.iblogger.org/wafaliwa.pdfIn PDF document text
    • https://mozalotajevel.weebly.com/uploads/1/3/2/6/132682758/4600591.pdfIn PDF document text
    • https://cdn.sqhk.co/folikulezig/gfbgfTg/lovejoy_high_school_staff.pdfIn PDF document text
    • http://gixepabu.22web.org/suwurifomilan.pdfIn PDF document text
    • https://banabujoro.weebly.com/uploads/1/3/0/7/130776007/rolodurirulogaman.pdfIn PDF document text
    • https://xajerunufunofe.weebly.com/uploads/1/3/1/3/131378991/dipotorudatas-zigup.pdfIn PDF document text
    • https://dawipufa.weebly.com/uploads/1/3/3/9/133986453/pikamuk_lowunasel_kugilofakapug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375694/normal_5fe64584941a0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wegorabeg.atwebpages.com/64081221391.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_off0000e626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE626 5028 bytes
SHA-256: 59c7d532b78f42ff376f5ca3bdf1ab22bb9f540db9588dd8675d092c3b74f153
font_01_sfnt_off0000f72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72C 11364 bytes
SHA-256: 82dd75d40737475e2ef0059928a3d68cc80cc0c96a288550a6d7c8f55614cc37

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