Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce6e0171a6731f94…

MALICIOUS

PDF

113.0 KB Created: 2021-03-28 21:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0c87bd3466002e71c850f7694c93a361 SHA-1: aec39636e28d6f14e3752f33935631673fa7c3ed SHA-256: ce6e0171a6731f943a25ca5a65af173229e0d5d759889b59cb468cd1e3ecea2a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm designed to lead users to malicious sites. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and numerous external URIs suggest it's intended to facilitate initial access, likely via spearphishing attachments, leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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=steve+jobs+aaron+sorkin+pdf PDF link annotation
    • http://checkmycredit.info/43072563449rau3t.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/zCijOtx/degefosefadabo.pdfIn PDF document text
    • http://lnstagramcopyrigtservice.com/xofivekak1i2qt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387573/normal_605a3759df7e0.pdfIn PDF document text
    • https://cdn.sqhk.co/bagadogod/djhojgY/cute_tumblr_backgrounds_for_laptop.pdfIn PDF document text
    • https://cdn.sqhk.co/raxuzuvuluf/jfcVidG/38541008754.pdfIn PDF document text
    • http://kzrovk.xyz/vegas_pro_14_full_patchclw8x.pdfIn PDF document text
    • https://cdn.sqhk.co/biziduwime/jhFYgcX/file_manager_windows_download.pdfIn PDF document text
    • http://amsidgi.xyz/hematology_rodak_free_downloadnldk3.pdfIn PDF document text
    • https://cdn.sqhk.co/nexoratuxi/ajjvvUR/pinkfong_tracing_world_full_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382405/normal_600a036a1dcf6.pdfIn PDF document text
    • https://cdn.sqhk.co/punipopi/eKijeLc/1355871471.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448733/normal_5fec2ed57032f.pdfIn PDF document text
    • https://cdn.sqhk.co/zanotunuzi/hhdhhgF/fitbit_charge_3_bands_leather.pdfIn PDF document text
    • http://sportplays.ru/83110147887brjfa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386365/normal_5fd3bdb59b169.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418191/normal_602983378a77a.pdfIn PDF document text
    • https://cdn.sqhk.co/loxowopiv/BUghAih/2nd_grade_activities_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/vonewesipan/8YjjijI/5128829705.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://56148a0a-83a3-4003-94ff-78d3044b7c00.filesusr.com/ugd/6f5f23_b810a390196343398926a6ca01b9be11.pdf?index=trueIn PDF document text
    • https://288c7b4b-0494-48f6-8ee2-9dd519b96b0a.filesusr.com/ugd/a107db_acb8f775dfdc4336a9282e8bec47b336.pdf?index=trueIn PDF document text
    • https://e1cf253b-b3af-4135-a675-1c3c021177f9.filesusr.com/ugd/111c46_693a44beb14d4377a5939fd373c1faf6.pdf?index=trueIn PDF document text
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_4bf5fc6e64284135bd6169b4e56929c0.pdf?index=trueIn PDF document text
    • https://47c0d0ed-94e3-447f-940a-e265262d053f.filesusr.com/ugd/a43ec6_93e726ca4765424a8b62cd7bb78beb79.pdf?index=trueIn 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_off00017a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A95 5448 bytes
SHA-256: 64f6bcd6fd1958e2ce2112699f7f5246a0fae7adde06fcea774740c270e0b81b
font_01_sfnt_off00018d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D30 12208 bytes
SHA-256: 2bd18b53bfbc0bb7407e95e7d2fd3aab0dc1fc08e9fae768a7bf15df74fdd7bc