Malicious PDF — malware analysis report

Static analysis result for SHA-256 146497c908366847…

MALICIOUS

PDF

88.2 KB Created: 2021-03-31 23:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 5237e1b9c78a189d0cbc827e42327581 SHA-1: 2fbe5c5db9582159177486101641334a61483ec6 SHA-256: 146497c90836684779b6980c5430fc7c84a57cd8a9ba4138d62290f6eb1f80c0
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains, suggests a link farm designed to redirect users to potentially malicious content. The embedded URL points to a domain associated with phishing and malware distribution, likely serving as the primary lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://jumiwimov.ru/123?utm_term=dead+awake+2016+movie PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495065/normal_6025e81c10773.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423166/normal_603410f834017.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446923/normal_5ff3896817fed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415527/normal_60016f2ce4b70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490138/normal_5fea289d2933e.pdfIn PDF document text
    • http://derikibavuji.22web.org/79449626645.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481420/normal_60547aac89e76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452161/normal_6035f63df03eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454995/normal_5fecc8406e3a7.pdfIn PDF document text
    • http://renakuw.iblogger.org/71331558315.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447097/normal_5fdcdfc409c65.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451228/normal_60017b7f11edb.pdfIn PDF document text
    • http://vivudanu.scienceontheweb.net/wordly_wise_3000_book_8_lesson_14.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://giruwixavitunav.epizy.com/kidde_smoke_detector_keeps_saying_low_battery.pdfIn PDF document text
    • http://rususekobijo.myartsonline.com/acoustic_guitar_lessons_download.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/linda_goodman_astrology_books.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/wuduvivamabujikage.pdfIn PDF document text
    • https://1864c106-1a4f-4194-99fb-dabd5a0af450.filesusr.com/ugd/17b194_e9964405864546ee8482a394ba2168f3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/adobe_photoshop_lightroom_pc_apk.pdfIn PDF document text
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_81d5f7b4f14143648672d7bcbf0f9c81.pdf?index=trueIn PDF document text
    • http://luzutajezilako.rf.gd/94846557011.pdfIn PDF document text
    • https://161abad2-7de2-49bb-9904-d6e2a620a662.filesusr.com/ugd/2eec94_3c63ce5317134184bcb354927e5c1330.pdf?index=trueIn PDF document text
    • https://19f621d4-ab03-49b5-bf1d-c78de40104d4.filesusr.com/ugd/bc84a3_888952f7a22a44f8a824b421be35ba66.pdf?index=trueIn PDF document text
    • https://5e20aa6b-77ef-4f11-9344-5454fb7c649c.filesusr.com/ugd/fb3aa9_496dfcab4ce14d319a88f40cfaf02056.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001034a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034A 5360 bytes
SHA-256: 8351773bbc55636b9a086683a9a6b821a4e994d4468116a150ae6d8fe368baf8
font_01_sfnt_off0001159d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159D 11668 bytes
SHA-256: 00c35c31052db1ec4709bf745f72e8ae4766e6877c66907102deb09b021cf91e
font_02_sfnt_off00013c8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C8A 16092 bytes
SHA-256: c9557d91917e40dbb2ce09b7ef560a04a9a832ffe2ebcac6b50408a58351272e