Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd4449d9c69f372e…

MALICIOUS

PDF

81.4 KB Created: 2021-06-09 09:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: abb25aae2e3f3ae2d63e4ba70983379c SHA-1: b4401cf56d3e090b762734fbb28140135cb44027 SHA-256: cd4449d9c69f372ebcc02199e4f0dea9defd840eadfe7d58f63117664e99f351
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 0.9992

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://laborke.ru/pbw?utm_term=crash+bandicoot+psp+iso+full PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369781/normal_5fdc552bc9f07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369514/normal_5fe7f10e1701c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481671/normal_6060fb27c8bfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387427/normal_60bdcb3c6282d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416805/normal_606e23695e968.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464877/normal_603065f50eed3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385421/normal_5ffbb1e1a3ae7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443356/normal_6007b706c6b27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495860/normal_603d7ded7da1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445564/normal_604678c3b289a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426416/normal_605a029fa508e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gutopevif.pbworks.com/f/gta_iv_game_free_download_full_version_for_pc_windows_xp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb402fd5-c6f1-4648-b0c2-4f5b8cc7c562/19708761425.pdfIn PDF document text
    • http://dobifapig.pbworks.com/f/74141721005.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80e41d80-b769-4924-9b67-7ddf7a061ac4/24161619125.pdfIn PDF document text
    • http://madatev.pbworks.com/f/vufibazumaxujewaguvelan.pdfIn PDF document text
    • http://jorowad.pbworks.com/w/file/fetch/144812388/62282843258.pdfIn PDF document text
    • http://dajodovilav.pbworks.com/w/file/fetch/144533652/4446447823.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8390fdbd-abda-4122-9da2-f02bc78743b2/what_were_the_consequences_of_the_bolshevik_revolution.pdfIn PDF document text
    • http://lokiboz.pbworks.com/w/file/fetch/144442530/clutter_bugs_beware_reading_answers_ielts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a51233e8-cbcb-45c9-ae0a-c11feebb556f/rerivudebom.pdfIn PDF document text
    • http://kafunujazuwo.pbworks.com/f/define_acidimetry_and_alkalimetry_titration.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83c409c5-ba16-470f-a687-71148ac321c9/kjv_strong_bible_and_concordance_apk.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_off0000e33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33F 5288 bytes
SHA-256: 6336e5fe096af302980dd80f6b51c1127a78001a30b0c61ca0e59ac8a7c4371d
font_01_sfnt_off0000f52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52A 15744 bytes
SHA-256: 4b3d4a3c2b90371653ccf152336e846f37bc7ab6f7c42956478a4be79573574a
font_02_sfnt_off00012187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12187 16120 bytes
SHA-256: 792b17e2d8b7926bbf982488bb4a17e77740ea3a38fff94c5bbd2958d4a1dfd7