Malicious PDF — malware analysis report

Static analysis result for SHA-256 a675742a88bc62aa…

MALICIOUS

PDF

93.2 KB Created: 2021-03-30 00:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8837a436c4f0394a3d2e2c13265c85b0 SHA-1: 26c2c83ae47ba03fda0bad1ac1e06f06d97c799e SHA-256: a675742a88bc62aa0cabc498c30fce1b35e331a48e380185ab322cddffa4d2b4
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'seumenha.ru'. The PDF structure and embedded content suggest it is designed to redirect users to potentially malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the PDF's nature and URL reputation indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://seumenha.ru/strik?utm_term=describe+a+lake PDF link annotation
    • http://fiziwafofekaku.mygamesonline.org/basic_english_grammar_tense_free_download.pdfIn PDF document text
    • http://nosixavol.sportsontheweb.net/96912450777.pdfIn PDF document text
    • http://resipowepo.getenjoyment.net/all_cocktail_recipes.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/1cbc257f-35ec-469a-aff0-bcc07cbe68e8/63521231153.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df0998a4-eb93-4cf4-87dd-0f301353a8f4/list_of_greek_gods_in_percy_jackson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a434959-cc10-47fd-bb92-709101a7238a/30792885217.pdfIn PDF document text
    • http://rowebilit.epizy.com/coliform_bacteria_test_in_milk.pdfIn PDF document text
    • http://japuxizikaroviv.rf.gd/awards_current_affairs_2020_19.pdfIn PDF document text
    • http://bumejefivoxigo.myartsonline.com/dimemutitixuxazose.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0c9e6c7-a53b-447a-a98a-d2269e69625d/wodag.pdfIn PDF document text
    • http://rixoxufutafugi.rf.gd/coordinate_geometry_formulas_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55a43e84-f5ca-4d7b-a74d-e21952d9e733/beats_by_dr._dre_solo2_wireless_on-ear_headphones.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac5bced7-85b4-4532-8e82-53eac0bf4754/zizew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38435ddc-87c4-4e43-b7fa-e7d203cd4bd5/manifiesto_comunista_descarga_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bbaf486-feb1-45d1-869e-ba56c8179eed/line_6_spider_iv_15_watt_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/948a84a1-aaed-4e5e-84c2-dddcdbf2b9c7/rafulajuperisonezupi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/290ca6b8-7dd8-4cac-b3aa-c6bcea48b1f0/whats_the_difference_between_hero_7_white_silver_and_black.pdfIn PDF document text
    • http://jilevatawew.epizy.com/zajibafanobazaledenijib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eca90012-d794-4ca2-b4d9-a502fd9a7e24/how_long_to_smoke_fish_in_little_chief_smoker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c0ced22-a67b-4e5b-ad5a-9642b79d6a23/43142164330.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92120ee0-b1e8-42c0-b82b-189d0d9d381d/crossfit_workout_for_at_home.pdfIn PDF document text
    • http://buzumigasox.myartsonline.com/pubavupadug.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_off00012329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12329 4488 bytes
SHA-256: 5d14f63bda97791531715f396d832e08a359969794fd81b95199e7e0e91a6e1c
font_01_sfnt_off00013267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13267 12264 bytes
SHA-256: 1bb22af6f43c474952d3e9124c0a5e46ac6a968f1627013ff0d442a763efd452
font_02_sfnt_off00015974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15974 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71