Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a28a97a0e337676…

MALICIOUS

PDF

86.0 KB Created: 2021-02-26 00:14:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 83ac0843f508081695d379ad106bcba4 SHA-1: d45754769e73e742d8b72fdc8e54789dc38dcaa2 SHA-256: 9a28a97a0e33767676589ec899a338faf773947a2867f1d3380422f3e56bb0c3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL (`https://maypoin.ru/strik?utm_term=how+do+you+connect+roku+to+wifi+without+remote`) appearing in both the document body and heuristics, suggesting a phishing or redirection attempt. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of using disposable hosting for link farms, further supporting a malicious intent. The ML classifier and ClamAV detection strongly indicate malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/strik?utm_term=how+do+you+connect+roku+to+wifi+without+remote PDF link annotation
    • http://trynon.xyz/54234559022yv17q.pdfIn PDF document text
    • http://elerctum.org/xigusoxesekosopexagcagox.pdfIn PDF document text
    • https://nolenefin.weebly.com/uploads/1/3/4/6/134629259/3554886.pdfIn PDF document text
    • http://jekenufakewe.mypressonline.com/como_preparar_cebada_perlada.pdfIn PDF document text
    • http://denizan.com/marvel_contest_of_champions_ios_hack_apkmukye.pdfIn PDF document text
    • http://xisulekotitis.iblogger.org/red_bus_app_for_pc.pdfIn PDF document text
    • http://raftgjgr.space/tarot_cards_3_card_spread_yes_or_no59zzx.pdfIn PDF document text
    • http://mapotilij.mygamesonline.org/honda_rancher_350_parts_list.pdfIn PDF document text
    • https://kufudazasa.weebly.com/uploads/1/3/4/6/134626120/muzozuwukide.pdfIn PDF document text
    • http://mupizunosakoga.22web.org/10550584526.pdfIn PDF document text
    • https://zebilukirun.weebly.com/uploads/1/3/5/3/135306511/4537596.pdfIn PDF document text
    • http://springtea.space/29219950138wrad1.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/tubukeganuji/85436209267.pdfIn PDF document text
    • http://tefinavi.epizy.com/ethical_fashion_report_baptist_world_aid.pdfIn PDF document text
    • https://s3.amazonaws.com/tosego/97785510516.pdfIn PDF document text
    • http://bavosezema.epizy.com/finding_limits_by_rationalizing_worksheet.pdfIn PDF document text
    • http://vegozuw.epizy.com/arcane_mage_levelling_guide.pdfIn PDF document text
    • http://ferenekukosazu.epizy.com/turidopimazesoxoraduvud.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/40983575396.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001217c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1217C 17564 bytes
SHA-256: deff919db3282ee865740584eaf0c89f81f6a8493fae615a34b518bf8c7a4861
font_00_sfnt_off0000ef11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF11 4944 bytes
SHA-256: 5d00c6a448efd6e2fd9f9e87381a344bdf3812b6f0aefcfd1642ae52ceb38887
font_01_sfnt_off0000ffc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC2 9764 bytes
SHA-256: e47540480d3f64fed06ea973614f635f8eec47cf8e992a150bec425ab464709b
font_03_sfnt_off00013bb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB7 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2