Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a2603cb5c01d61…

MALICIOUS

PDF

67.2 KB Created: 2021-03-12 16:49:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: fe2c6ef748ada36adf7cf1976271840f SHA-1: 5b6e1947715bd41f413c785f4992816d63a2dc2e SHA-256: 83a2603cb5c01d6114cf4dc257742918df0f0e94eaa4d511ae26af38f79729f6
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://lozipotod.ru/wix?keyword=brother+cs6000i+manual+e6 PDF link annotation
    • https://cdn.sqhk.co/puxolika/ayizQKA/top_100_bollywood_songs_mp3_download.pdfIn PDF document text
    • https://vojerured.weebly.com/uploads/1/3/3/9/133999986/3125841.pdfIn PDF document text
    • http://rajedat.iblogger.org/59383731518.pdfIn PDF document text
    • https://firerokuk.weebly.com/uploads/1/3/1/1/131164187/xuworexiviwifaxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410222/normal_601263c76a4e3.pdfIn PDF document text
    • https://cdn.sqhk.co/pugepavofu/LMkgihc/driving_schools_near_me_automatic.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445868/normal_5fd68b7086883.pdfIn PDF document text
    • https://cdn.sqhk.co/jobiwokojo/iichagh/26865764469.pdfIn PDF document text
    • https://cdn.sqhk.co/rogekanus/aJZM1ug/teacher_apps_for_parent_communication.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/ig8dhhT/find_my_iphone_app_on_apple_watch_4.pdfIn PDF document text
    • https://cdn.sqhk.co/senosekagoko/j6eCif6/14881402166.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447095/normal_604a94a188c5d.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/Yhbhcih/6781701798.pdfIn PDF document text
    • https://wexotagupoma.weebly.com/uploads/1/3/2/8/132814474/4288ad6d1f40e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411701/normal_603fbcff6c984.pdfIn PDF document text
    • https://cdn.sqhk.co/bisadidizi/hjxXBrj/18316217790.pdfIn PDF document text
    • https://cdn.sqhk.co/koditisalupe/aghmHjc/pixel_combat_world_of_guns.pdfIn PDF document text
    • https://norofuzalugegok.weebly.com/uploads/1/3/4/8/134882219/vudeboves_pivonu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ziwotivusatufif.rf.gd/5181795475.pdfIn PDF document text
    • http://xupudajiwozov.epizy.com/best_alarm_ringtone_free.pdfIn PDF document text
    • https://041bbef9-4dd1-43b9-9ec7-2672afc16ec1.filesusr.com/ugd/686814_e3ca6bf50d5d4f0490e5deb5d59bdf7d.pdf?index=trueIn PDF document text
    • https://5984e891-aecd-43e6-866f-efdb297c9c35.filesusr.com/ugd/403565_e98f1c01e89b4cb499ea5a3467f4f9f7.pdf?index=trueIn 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_off0000c808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC808 5384 bytes
SHA-256: 0ecf1c4861815ab816397b8375f6eb3a1be86378ec043b3a4ca45ab2acabe644
font_01_sfnt_off0000da29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA29 10856 bytes
SHA-256: 2fbe857b7f6f916eaeeeb8b30364c6a225282dc5763419d01e9b74519c4fce2c

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