Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1bd00eea95bf7b6…

MALICIOUS

PDF

74.2 KB Created: 2021-01-20 15:33:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 186119f6d3746d1e822daaefb9f09757 SHA-1: 7432266a6a85f8c9f013df3a2f312d91bb2e3a10 SHA-256: a1bd00eea95bf7b642742e6e47b2494c9c35bef6ab031b6ae01ecbe2cb5c593a
126 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to educational worksheets, likely to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://bologen.ru/123?utm_term=common+monomial+factor+worksheet+with+answers+pdf PDF link annotation
    • http://xigosilefonaboj.iblogger.org/kepovota.pdfIn PDF document text
    • https://site-1227582.mozfiles.com/files/1227582/92561669138.pdfIn PDF document text
    • https://site-1176787.mozfiles.com/files/1176787/fapuruwowozoxisobux.pdfIn PDF document text
    • https://cdn.sqhk.co/povuguzuloga/ghT3Li3/download_assassin_archer_modern_day_robin_hood.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/hhj2cgc/75915607855.pdfIn PDF document text
    • https://cdn.sqhk.co/wudawagirus/jiagi13/burger_time_arcade_gameplay.pdfIn PDF document text
    • https://motonolezigit.weebly.com/uploads/1/3/2/8/132814123/zaxapezelo.pdfIn PDF document text
    • https://site-1174757.mozfiles.com/files/1174757/basic_guidelines_for_diabetes_care.pdfIn PDF document text
    • https://cdn.sqhk.co/niporatibu/e9ijibV/race_car_track_for_birthday_parties_los_angeles.pdfIn PDF document text
    • https://zixavuxo.weebly.com/uploads/1/3/1/3/131398386/43c0a9a94f5c.pdfIn PDF document text
    • https://juxibawazorar.weebly.com/uploads/1/3/3/9/133997202/37129.pdfIn PDF document text
    • https://site-1199436.mozfiles.com/files/1199436/cookie_sheet_pan_organizer.pdfIn PDF document text
    • https://site-1168150.mozfiles.com/files/1168150/juventus_roster_2016.pdfIn PDF document text
    • https://site-1258855.mozfiles.com/files/1258855/nafirisosibafagizifa.pdfIn PDF document text
    • https://site-1176454.mozfiles.com/files/1176454/cross_stitch_floss_storage_box.pdfIn PDF document text
    • https://site-1172629.mozfiles.com/files/1172629/sezasubinupobizaz.pdfIn PDF document text
    • https://site-1174439.mozfiles.com/files/1174439/general_montgomery_battle_of_the_bulge.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/fowonaxul/xitepodeguletetibajor.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/arabic_to_english_words_list.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/kalender_akademik_itb_2019.pdfIn PDF document text
    • http://kadegezopofog.rf.gd/sijapirumumizedital.pdfIn PDF document text
    • http://dimaninerif.rf.gd/79921353065.pdfIn PDF document text
    • http://wereguvepowu.epizy.com/happy_diwali_animated_images_free.pdfIn PDF document text
    • http://nezenomawaza.epizy.com/angular_material_checkbox_form_field.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_off0000e3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EC 5456 bytes
SHA-256: 49d4e9d8f0f8d5968aa8e7db2afe54f0959585770980f74327d4876180266ad5
font_01_sfnt_off0000f662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF662 10504 bytes
SHA-256: c913de8e87be67e8917f44f65dca84939e9d0563daf87688a3fae9a0b67de7bb

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