Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca85ddcb5b77b349…

MALICIOUS

PDF

75.8 KB Created: 2021-03-10 04:46:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 0308e40c22047c412c789890d6d64370 SHA-1: 15b06e8eeccd3f1231e1c3261921df0c73f04356 SHA-256: ca85ddcb5b77b349f277e0aae4071f5e12cd021ebc33be4eae767bdabaa6fb43
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for SEO poisoning or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content, likely a phishing page or a downloader.

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://ponafet.ru/award?keyword=causas+de+la+caida+de+tenochtitlan+pdf PDF link annotation
    • https://magudutetu.weebly.com/uploads/1/3/1/4/131437318/049cc7.pdfIn PDF document text
    • http://antonioita.fun/93984913098xu75v.pdfIn PDF document text
    • http://idealicaitaly.site/790811152590pyuv.pdfIn PDF document text
    • https://mubazujozij.weebly.com/uploads/1/3/4/7/134705676/1413515.pdfIn PDF document text
    • https://manovofaripoluf.weebly.com/uploads/1/3/1/4/131453531/1998118.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475209/normal_5feb43285859e.pdfIn PDF document text
    • http://teleporttur.ru/15296207195gbnz1.pdfIn PDF document text
    • https://cdn.sqhk.co/vafizolubev/MTAghTf/viregeju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366401/normal_5fd79766cc596.pdfIn PDF document text
    • https://jevomijaled.weebly.com/uploads/1/3/1/8/131856338/fibebuxugoleliwogelo.pdfIn PDF document text
    • https://cdn.sqhk.co/zarejesorufo/iigfgff/messenger_lite_old_version.pdfIn PDF document text
    • http://momentshop.space/xidomimov06h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502721/normal_6029fb2b8b564.pdfIn PDF document text
    • http://buyfastedcircle.xyz/81973523720bd5re.pdfIn PDF document text
    • http://1xbets-reg.site/android_app_development_course_for_beginners_free_with_certificatehekgx.pdfIn PDF document text
    • http://pagebake.com/grohe_faucet_replacement_partsqh73r.pdfIn PDF document text
    • https://cdn.sqhk.co/dadirowuj/hr72Z50/29822314869.pdfIn PDF document text
    • https://pulezigo.weebly.com/uploads/1/3/4/6/134600697/kopoxuluzu.pdfIn PDF document text
    • https://cdn.sqhk.co/lenufetimop/5niiiS3/13317130333.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C6 5052 bytes
SHA-256: 18e2d26e82440df8e2c7f2f20eebe8c001259d09df685aa78f72b3cf16838b4a
font_01_sfnt_off0000faf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF2 11564 bytes
SHA-256: 620753901327e90ddb4117a5ab7d47d24a9f57bd195f6b95744a3dd0b45ec9e5

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