Malicious PDF — malware analysis report

Static analysis result for SHA-256 e50ff21f8cce627b…

MALICIOUS

PDF

75.5 KB Created: 2021-04-04 10:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 69890f896e6de93a5e20273fa66e3e39 SHA-1: 2af9d8084a4c009fd64818bb243a28ea90d56fd1 SHA-256: e50ff21f8cce627bde31308e5c38f4ef629a5ae3603142048b5a388b2477d628
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 embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jottigo.ru/wix?keyword=olivet+middle+school PDF link annotation
    • http://pubgmobiie.com/posumunubifoguse8w7b2.pdfIn PDF document text
    • http://fomuvegikutidob.iblogger.org/educational_vocational_guidance.pdfIn PDF document text
    • http://winoraama.fun/define_obsolete_formqsngh.pdfIn PDF document text
    • http://vash-komfort5.ru/62479418457azg78.pdfIn PDF document text
    • http://salet.store/roomba_770_error_5k04d9.pdfIn PDF document text
    • http://hamlikjorettoop.ru/wetusaxosusozatudewukiku8fobz.pdfIn PDF document text
    • http://steh-sistem.ru/was_seal_team_cancelled_2020org0d.pdfIn PDF document text
    • http://fishland.store/what_are_the_latest_computer_technologyydnk8.pdfIn PDF document text
    • http://bella24.xyz/association_for_child_and_adolescent_counseling_was_founded_in_the_yearnw895.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/susarupidavom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cc60dbc-028c-4453-bfc1-656e439f0b7b/the_lightning_thief_movie_trailer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f76f607a-89e6-41ea-a6bb-7b3b1e2f055f/98356399551.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77e1d99d-31f0-467f-b729-6f455b4b31cd/65408822627.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/first_grade_math_worksheets_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d631c751-5b4f-483b-b40b-e0e708b4b411/murray_12.5_hp_40_riding_mower.pdfIn PDF document text
    • http://jibomivuren.epizy.com/basel_2_document.pdfIn PDF document text
    • http://sogefotatuledis.epizy.com/wind_of_change_lyrics_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99444240-666b-4519-a578-2b97dd94a574/original_3d_crystal_puzzle_skull_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/kusogujatenojil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27049747-8720-48e1-9812-db5ceac6916b/psalm_34_esv_bible_gateway.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/wings_of_fire_dragon_tribe_test.pdfIn PDF document text
    • http://fakomufe.epizy.com/17859820496.pdfIn PDF document text
    • https://s3.amazonaws.com/fasudikek/94164299104.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDB 4960 bytes
SHA-256: 5b07019e69ee721843320f6b8945659a8705e54e75c6f7d04beb7182022a8ea8
font_01_sfnt_off0000fca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA1 10540 bytes
SHA-256: 56764f74fa50ea1db37a73588bde25e5972f9d4e4f54949345f0495659d8e37b

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