Malicious PDF — malware analysis report

Static analysis result for SHA-256 550405479bb18ed7…

MALICIOUS

PDF

85.9 KB Created: 2021-03-29 10:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e4977522937f9f60b3a3b243f5f9b470 SHA-1: f5b3bd73a236ff989bf3fbfa13d5f25a86327be8 SHA-256: 550405479bb18ed79e3cf1277283cd8414d5b3ac96c717a9ce0945d6e0ac1ee9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, indicating a strong intent to redirect users to malicious content. The presence of 'utm_term' parameters suggests tracking or campaign-specific lures.

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://vilenefex.ru/123?utm_term=bonetown+ppsspp+android PDF link annotation
    • https://cdn.sqhk.co/vunalogivefu/gegjjVk/80213432767.pdfIn PDF document text
    • https://toxekemugig.weebly.com/uploads/1/3/4/4/134484635/4513525.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407983/normal_6025c174a170b.pdfIn PDF document text
    • http://allfreebets.ru/quarterback_ratings_worksheet2aukq.pdfIn PDF document text
    • https://bujubemido.weebly.com/uploads/1/3/0/7/130776032/dikizigovizi_fisajowamasega_difijepa.pdfIn PDF document text
    • http://xuribof.medianewsonline.com/125181883.pdfIn PDF document text
    • http://ladyso.ru/649610661229rdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455399/normal_5fd0fb8778366.pdfIn PDF document text
    • http://mebelintera.ru/xefoliwokinueleg7.pdfIn PDF document text
    • http://okclub.org/69169500682vaiy8.pdfIn PDF document text
    • https://bosowumajozidu.weebly.com/uploads/1/3/0/7/130740465/6553820.pdfIn PDF document text
    • http://nevinidonet.mywebcommunity.org/bourree_bach_guitar.pdfIn PDF document text
    • https://cdn.sqhk.co/bupewazadufa/f1OLhg8/rowutibilobumazixuvoxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407062/normal_6010d0fed8e5d.pdfIn PDF document text
    • https://cdn.sqhk.co/nowavutu/bGck5tf/76606226858.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370989/normal_603c29ad4a315.pdfIn PDF document text
    • https://cdn.sqhk.co/bexefoboxevi/iygjScX/65837000897.pdfIn PDF document text
    • https://cdn.sqhk.co/tosuwukiwate/jDrEejF/game_tower_defense_mod_apk_revdl.pdfIn PDF document text
    • http://mibejar.sportsontheweb.net/intex_sand_filter_settings.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/9dac9c79-4b96-42f2-84d7-378a531c7061/html_programming_books_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbd5c8eb-3b58-4ddf-9331-e181fe764a77/troy_bilt_super_tomahawk_2_in_1_chipper_shredder_manual.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ede5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE5 4852 bytes
SHA-256: d060f9a867d37f89011b83379f68dab544dc6d41098c1167e68cc3a6dad6e4c8
font_01_sfnt_off0000fe74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE74 11716 bytes
SHA-256: fa59126ae9e1e7bb2718274a0883bf7896742e1d95053948a50fc7fcaae40cd1
font_02_sfnt_off00012674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12674 16296 bytes
SHA-256: 15128285344048d76b584a6587ab2ccb2c75eee889948d4c665368cae9e92c8f
font_03_sfnt_off00013bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF1 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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