Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9d4c3de312eb029…

MALICIOUS

PDF

76.9 KB Created: 2021-06-14 16:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c179558c5390117ba27e993a84656cf5 SHA-1: dd7328d7ae39ee0c079a28a971ecc25e9bf55262 SHA-256: e9d4c3de312eb029cbc3be8172c1c418ddfb811e5bb605280cf818556ba8e74a
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to 'nomylo.ru', which is flagged as a link farm on disposable hosting. ClamAV detection and ML classification strongly indicate maliciousness, specifically as a phishing trojan. The document body, though heavily obfuscated, contains text fragments suggesting a lure related to 'calculus pdf'. No scripts were extracted, but the presence of external URIs and the nature of the heuristics suggest this PDF is designed to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://nomylo.ru/pbw?utm_term=calculus+pdf+t%25C3%25BCrk%25C3%25A7e PDF link annotation
    • 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/83a7fe5b-b808-4932-98fc-4650aa313f62/16240732729.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1b7af8e-9c02-4825-b95f-7ff6ddfa336d/43815314829.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c953dc0f-c4bc-40d6-9993-0be0e794b44d/how_long_does_it_take_for_i_130_to_get_approved_for_spouse_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fe1ab69-0903-4ca5-817f-fb21ed66d9a8/how_to_make_your_own_social_security_card.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7908798-8ec2-4b8e-8563-f355821f5288/jikowukopiroxefipusefoxif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d03d138a-b462-4219-b84a-434c09e334f8/madorisamekagenapefevuki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14dc42c8-49e5-48c9-ac8d-6ce963f6e7dc/hp_laserjet_4050tn_driver_download_windows_7.pdfIn PDF document text
    • http://jozeluwofe.pbworks.com/f/32149836790.pdfIn PDF document text
    • http://popuwepux.pbworks.com/f/neladadev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c73abe9-45c7-4bef-bfa0-d9c1b2975347/96524290457.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01076278-2cf1-40ef-b0e6-02a4af478438/93575576980.pdfIn PDF document text
    • http://bawamotijeku.pbworks.com/w/file/fetch/144449757/que_paso_ayer_2_banda_sonora.pdfIn PDF document text
    • http://ziduzobif.pbworks.com/f/gta_san_andreas_cleo_mod_download_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7425d73d-016a-4339-86c8-58ee88623627/gusolamolotiwofuminok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5affb823-39d6-496a-9691-7bbbb5c83748/ralujufetise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a8e256f-0bd0-4f6a-8f45-b8d8f3edf41e/simplify_by_adding_like_terms_calculator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f2f111b-6af0-4c94-8514-48c8027a372b/music_and_movement_activities_for_preschoolers.pdfIn PDF document text
    • http://bemulopawed.pbworks.com/f/16714219705.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9786848e-763a-413f-8df0-8804735d17c2/partituras_de_canciones_para_piano_faciles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1acdff3-97a2-4c9c-85a3-893f26b2e93a/how_to_pair_jbl_flip_speaker_with_iphone.pdfIn PDF document text
    • http://sujagajo.pbworks.com/f/what_is_dr_berg_diet.pdfIn PDF document text
    • http://tefuraviwuw.pbworks.com/w/file/fetch/144773523/speaker_sound_booster_apk.pdfIn PDF document text
    • http://bemulopawed.pbworks.com/w/file/fetch/145261533/68827694077.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddc95b17-8156-4d87-8f5b-d8826247f9a0/lokubodozezifir.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF01 5156 bytes
SHA-256: f8339e95c05af8518a8e605029f8be956d71b347007f358a835ca8b97bcc2813
font_01_sfnt_off0000f027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF027 12176 bytes
SHA-256: 719d2b6a9ff3777aaeaaf1835d7b011d0f993631ef6e87dde0994e8c0279e3b8
font_02_sfnt_off000116ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AD 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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