Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d133407996a3c01…

MALICIOUS

PDF

84.8 KB Created: 2021-03-23 19:21:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ee3486dd2a356009d6c7c18a4e816997 SHA-1: 48fed1b99e3556621e95912e6eeccf479b3c9272 SHA-256: 5d133407996a3c0171456016283d30222fda428543ae70c1dca875affd77144a
126 Risk Score

Malware Insights

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

The PDF contains numerous external URLs, many hosted on disposable domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

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://druttle.ru/123?utm_term=bestimmter+unbestimmter+artikel+deutsch+%25C3%25BCbungen+pdf PDF link annotation
    • https://cdn.sqhk.co/ximirujusuxo/j1fqOgg/hallmark_channel_roku_cost.pdfIn PDF document text
    • https://cdn.sqhk.co/dinigivo/ghgjc0J/gladiator_glory_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/hdshfie/wemaju.pdfIn PDF document text
    • http://gatorama.site/rumugidotekepekedisexopugnp7fj.pdfIn PDF document text
    • http://fruitnaturs.space/crackle_apk_for_android_boxjq2yj.pdfIn PDF document text
    • http://shoop-fo.ru/time_flow_time_and_money_simulatore1iqp.pdfIn PDF document text
    • https://cdn.sqhk.co/nadovexum/9KK1ahh/battlefield_board_game_instructions.pdfIn PDF document text
    • http://carishr.com/how_do_you_replace_a_water_heater_elementp7u1e.pdfIn PDF document text
    • https://cdn.sqhk.co/nefakovuwot/hjd1ibc/1st_grade_math_curriculum_books.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxisilogok/hcjdheO/55396524340.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxofabope/NjaOWjc/wedewadifexeguxiz.pdfIn PDF document text
    • https://cdn.sqhk.co/vuvupewog/gdjbdvN/33088448900.pdfIn PDF document text
    • http://meetly.space/471191619204ubia.pdfIn PDF document text
    • http://limaxinsto.xyz/roland_td_30_module_reviewuwsfd.pdfIn PDF document text
    • http://hookup682.site/h2_zoom_settingsepv81.pdfIn PDF document text
    • https://cdn.sqhk.co/totarujined/e3Ehhhc/perfect_attendance_certificate_template.pdfIn PDF document text
    • https://cdn.sqhk.co/parikozug/jv3ehh8/ruronasadixopotobo.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/pigolo/5577677431.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/tenancy_agreement_example.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_off0000f35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35F 5944 bytes
SHA-256: 5cac24d9195373f73c9ad701f6e8612094ec3d01eef1166635b297c4ca2a934d
font_01_sfnt_off00010741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10741 11624 bytes
SHA-256: 342ea2cc35b561edd49b7644168ef3bc06c886df8c1bbc857bfa90569e7c5e3c
font_02_sfnt_off00012d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8F 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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