Malicious PDF — malware analysis report

Static analysis result for SHA-256 f23126131be3df79…

MALICIOUS

PDF

80.6 KB Created: 2021-03-24 12:05:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 314c4b7fa8a7290cdd092ba5c23a0983 SHA-1: 2063cde1f7217db8051dc096fafc57f00d772660 SHA-256: f23126131be3df79554900cb10932b6d3193bc78b8098548125f632aadae1abc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9991

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://seumenha.ru/strik?utm_term=nike+air+force+1+pixel+trainers+summit+white PDF link annotation
    • http://katorewudejizut.22web.org/uscis_form_i-_912p.pdfIn PDF document text
    • http://profaudit32.ru/gikigokewejunglhd1.pdfIn PDF document text
    • http://peludofnor.fun/baregabav9v18.pdfIn PDF document text
    • http://fawetugamuxix.66ghz.com/finding_duplicates_in_two_excel_spreadsheets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402737/normal_6017a01e8e5ea.pdfIn PDF document text
    • http://varistop.site/diwexawulupzufwn.pdfIn PDF document text
    • http://zixudivibudizu.scienceontheweb.net/oxford_word_skills_intermediate_vk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426971/normal_5fee7e5ae1c23.pdfIn PDF document text
    • http://sallely.xyz/68738954406gozx6.pdfIn PDF document text
    • http://xevojifixifepi.scienceontheweb.net/vocational_guidance_journal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445324/normal_6049d9e8b43cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458144/normal_5fd8237acece7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458144/normal_5fec8a3a632ed.pdfIn PDF document text
    • http://ruluzuzadol.mypressonline.com/kurulojepudiziwibiru.pdfIn PDF document text
    • http://wexypay.icu/how_do_i_get_my_nespresso_vertuoline_out_of_descaling_mode7je3j.pdfIn PDF document text
    • http://itrom.fun/alcoholismo_en_adolescentes_perui5jki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lakivexa.epizy.com/thirsty_crow_story_in_malayalam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84fce71a-eb24-4596-9dc4-395ffb47d961/bafojiwude.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d416c3f1-539c-4ae5-9519-2a42a520e300/how_to_set_time_zone_on_marathon_atomic_clock.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3010ba93-2bbc-4958-9a81-bcc0785323a9/jajaratarogobumanefala.pdfIn PDF document text
    • http://lifotag.rf.gd/84015529288.pdfIn PDF document text
    • http://lelexuxifu.epizy.com/cold_rolled_sheet_thickness.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd9cc4c3-47f4-4e21-8f8a-2de8362860dd/ketaxo.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDB 5500 bytes
SHA-256: f737aa430e505de80d322e9b5a2cb6ff62f9404e314e7fcb4f5a25313e02dcde
font_01_sfnt_off0000f18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18F 15064 bytes
SHA-256: 466e57eb92468556eb9bd956627812201aaad7b99bc26bdd6cd4c586e4b148da
font_02_sfnt_off00011dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFC 16060 bytes
SHA-256: 1a51fac5cecc05d5f0a5d3b698ffe240ccab470cdba6a823ba27c6c2a12c20dd