Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b5f39a48cca278d…

MALICIOUS

PDF

79.5 KB Created: 2021-03-30 18:01:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: dc027894f7f725f5160815f49860a744 SHA-1: c354251e00cb0d79e748e256c28bc082b406a471 SHA-256: 8b5f39a48cca278dba2ddc605be7e8cde3b6a17d89dafc550eda52f6263870ad
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a phishing or spam campaign attempting to disguise its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/123?utm_term=powerpoint+circle+diagram+template+free PDF link annotation
    • http://somixewavado.sportsontheweb.net/moultrie_trail_camera_flash_not_working.pdfIn PDF document text
    • http://rastet-malysh.ru/schwinn_exercise_bike_ic4_reviewufsmg.pdfIn PDF document text
    • http://fevinoreniwelik.sportsontheweb.net/35086429390.pdfIn PDF document text
    • http://kusafomidufe.mywebcommunity.org/aia_vitality_points.pdfIn PDF document text
    • http://lirinevewafa.mypressonline.com/game_show_network_schedule_2021.pdfIn PDF document text
    • https://cdn.sqhk.co/vibupiwoxaro/WDghfdi/meditation_music_app_android_free.pdfIn PDF document text
    • http://rezltml.xyz/236952320718vsrt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378167/normal_605611669abb4.pdfIn PDF document text
    • http://help-bluebadgecenter.com/45690330298px8b9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489033/normal_5fec67cf77ba4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476272/normal_5fe27eb946254.pdfIn PDF document text
    • https://cdn.sqhk.co/konarolikomu/ogihbQU/siwasosuviraganowifejire.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491925/normal_5ff8c40a1f2bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366952/normal_6039ce0597c5c.pdfIn PDF document text
    • http://bovewitavivebu.getenjoyment.net/howls_moving_castle_piano_sheet_music.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e1107458-e67d-4788-b01f-26ed751a7ea9/wogasifuva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff7fb02c-974d-4a2a-9c67-4b8d1d330cc7/keurig_b60_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c59db5ec-c6c7-40c0-b316-bbbb99dcbbf3/noponowutojijudox.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9B 5180 bytes
SHA-256: 3f976d67d7f451a1023f5d780fa6dd9e40fca2e4e0e2320541ff402cfd344142
font_01_sfnt_off0000fc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2D 11216 bytes
SHA-256: 21e3290117b49c5fa931a45f9419176bdabbfac9d7fc1bb61f8ff9b05c8ba5c0
font_02_sfnt_off0001226e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226E 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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