Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f2b2b9f00a8c182…

MALICIOUS

PDF

81.4 KB Created: 2021-03-01 02:08:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e73dae9f0f41b513860db1c81a194270 SHA-1: d61f21683f4368f36001e9fcf274e9bfe60c3243 SHA-256: 7f2b2b9f00a8c182f99b88414bb917fb04ae89a151536c509dbaa025d41b28db
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/strik?utm_term=pentair+fns+plus+instructions PDF link annotation
    • https://cdn.sqhk.co/bapisolel/Gigjcgd/sas_survival_guide_en_francais_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tememagitapo/heHoIhh/59484805600.pdfIn PDF document text
    • https://misadedami.weebly.com/uploads/1/3/3/9/133997414/lenugudubozo.pdfIn PDF document text
    • https://jabibodusap.weebly.com/uploads/1/3/2/6/132681053/01169a698b816.pdfIn PDF document text
    • http://tuvawom.iblogger.org/insinkerator_badger_500_reset.pdfIn PDF document text
    • https://cdn.sqhk.co/zotofoza/qzhbYxq/cnc_machine_metal_cutting_price.pdfIn PDF document text
    • https://jazujopu.weebly.com/uploads/1/3/0/8/130873842/3683447.pdfIn PDF document text
    • https://cdn.sqhk.co/luwesefizi/haGihGO/vaxuwadu.pdfIn PDF document text
    • https://cdn.sqhk.co/dutaxato/RibajiZ/rocket_pocket_notebook.pdfIn PDF document text
    • https://cdn.sqhk.co/gilitejeku/qOCXged/40804565027.pdfIn PDF document text
    • https://cdn.sqhk.co/kufejagefep/ziejjga/virus_estomacal_en_ninos_duracion.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vedumojaje.epizy.com/bcd_format_converter.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/1666791197.pdfIn PDF document text
    • http://lamekukibudinos.epizy.com/cash_award_form_haryana_2018-_19.pdfIn PDF document text
    • http://tugosujamas.rf.gd/93099451644.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/lixaxogejejutulefisak.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00011071.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11071 21660 bytes
SHA-256: e5c914a279fb252925e3268805f2baee63c04f951f6423ad99e8c78a9f0914c7
font_00_sfnt_off0000d9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D1 5008 bytes
SHA-256: 4cb0030b4e591d64d71cb8b718a188537fbe9dc743845503b03471ec233a18a5
font_01_sfnt_off0000eaef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEF 10980 bytes
SHA-256: ba95bc3819b98d4ca7e5aa4d2c8249b7102cb74685668ed8ebb6d86d0d2ca2c6

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