Malicious PDF — malware analysis report

Static analysis result for SHA-256 33e796244983e97e…

MALICIOUS

PDF

75.6 KB Created: 2021-01-27 07:50:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 60acc48a8e9eaa1e8b698b9e8f264fe7 SHA-1: 2a92f611d8a495306fd3c8137adb6eb58aafca3a SHA-256: 33e796244983e97ea3f222b63bfb60ab446894889e86c67fe61aec4b43131368
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains multiple external URIs, including 'https://jacksth.ru/123?utm_term=5.1+the+cell+cycle+study+guide' and 'http://optamorem.com/pewdiepie_tuber_simulator_hack_onlinex1jsb.pdf', which are likely used to redirect users to phishing or malware-hosting sites. The PDF's structure and embedded links suggest it is part of a link farm designed to obscure the final malicious destination.

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://jacksth.ru/123?utm_term=5.1+the+cell+cycle+study+guide PDF link annotation
    • http://optamorem.com/pewdiepie_tuber_simulator_hack_onlinex1jsb.pdfIn PDF document text
    • http://pycnidwzxc.info/possessive_adjectives_exercises_advanced5a9j6.pdfIn PDF document text
    • https://cdn.sqhk.co/tijinujul/hbuiaWO/lukokefo.pdfIn PDF document text
    • https://cdn.sqhk.co/tijinujul/hejgSih/jakuliwive.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402478/normal_5fed48eab8654.pdfIn PDF document text
    • https://cdn.sqhk.co/tewokozogop/gPjehay/retro_city_rampage_dx_3ds_update.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417032/normal_6005403766f75.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376856/normal_5fcf7541007e6.pdfIn PDF document text
    • https://sazejibapox.weebly.com/uploads/1/3/4/8/134863873/wufir.pdfIn PDF document text
    • http://reduslim-italiaofficial.site/gezavowigewebef7ppfo.pdfIn PDF document text
    • http://trikotoria.ru/delicious_dessert_recipes_quick_and_easyzassi.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://s3.amazonaws.com/fejatepudopito/fssw_channel_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/prince_narula_nach_baliye_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/zuniverijesud/56904249754.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/bridal_mask_season_one.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/60991452862.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_off0000dde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE2 4776 bytes
SHA-256: 8139045564b499368dd6c4bb52609e17e19143a202f7fd0fa73b74d0617352ad
font_01_sfnt_off0000ee3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3E 10804 bytes
SHA-256: 5121326326ded9087318b2c4060c632c408c43559c9d09171406e6f9e03887bc
font_02_sfnt_off000112fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FE 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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