Malicious PDF — malware analysis report

Static analysis result for SHA-256 70e5892ae728c2b3…

MALICIOUS

PDF

83.4 KB Created: 2021-04-01 17:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c783fb27da1116e8aa730cad3691de14 SHA-1: 58e283f81019a24a4e3efc26fca266b6dcfb5200 SHA-256: 70e5892ae728c2b33c3fe5252cb9398906f8e0c4edb52b17873f6669315eef87
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/wix?keyword=gentry+public+schools+facebook PDF link annotation
    • http://javaxirivibewi.mygamesonline.org/bad_blood_john_carreyrou_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/vuvapolaxaj/jCod33O/cass_county_electric_cooperative_jobs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497079/normal_604fd1987b113.pdfIn PDF document text
    • https://cdn.sqhk.co/vetukalujir/p9ijgse/orixo_level_80.pdfIn PDF document text
    • http://dejepuzalew.mygamesonline.org/statistical_language_learning_charniak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466411/normal_5fe9ccaf74c05.pdfIn PDF document text
    • https://cdn.sqhk.co/sobexofap/diazGhe/sisters_oregon_real_estate_redfin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491673/normal_5ff6c274db306.pdfIn PDF document text
    • https://cdn.sqhk.co/jiluputumusi/bicHhaB/science_journalism_internship_uk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482848/normal_604845b193a29.pdfIn PDF document text
    • http://bibopasaxuvibu.mypressonline.com/artikel_tentang_akuntansi_keuangan.pdfIn PDF document text
    • https://cdn.sqhk.co/famuxina/zic6uNR/68597495866.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_ed466155311d40398074798db5338779.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7129802-3808-4702-b9c2-af88c0fed8df/56550269419.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65ed68a2-4e20-409a-8083-cfd415777faa/pull_up_bar_exercise_plan.pdfIn PDF document text
    • http://jabejanaboz.atwebpages.com/nutevaviz.pdfIn PDF document text
    • https://46d16763-6c5f-4e19-aa2c-3f4071fcbec2.filesusr.com/ugd/26f730_5d401111957d45e3b8750e51db08b58c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/88f27193-ac0b-436e-959a-750b43b6f5df/viwutalaforiwinalu.pdfIn PDF document text
    • https://a804c8a8-fdf7-4fba-b19b-c23aecc29597.filesusr.com/ugd/a7074a_6106abb97de54fa9a29ad1f56326f483.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_off00010795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10795 5440 bytes
SHA-256: 6718568223ac0995cbc6a42b4b6efa80401fb7125b856129eb6065ee6d674cb7
font_01_sfnt_off00011a1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1C 11152 bytes
SHA-256: c4d6af96c6d2cd47cc1cda84790013d29c910e34a46c7df0ffefa90f0e3e5b16

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