Malicious PDF — malware analysis report

Static analysis result for SHA-256 e516724b3a4ae478…

MALICIOUS

PDF

80.8 KB Created: 2021-04-23 08:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 09ef0b75e6a2838041b7c8fdd4089261 SHA-1: 7033b314e145627b9f8ae544c370f0193e0ad464 SHA-256: e516724b3a4ae47835d7b51cb43b774e62b2d27864162d36a5526d01219746d6
126 Risk Score

Malware Insights

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

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 0.9993

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://xezojetit.ru/strik?utm_term=the+outsider+colin+wilson+free+download PDF link annotation
    • http://hocostyle.ru/the_main_reason_small_businesses_fail_is_becauseq355f.pdfIn PDF document text
    • http://giwosoto.sportsontheweb.net/becoming_better_programmer.pdfIn PDF document text
    • http://silujokiz.mypressonline.com/adobe_reader_apk.pdfIn PDF document text
    • http://ririzobe.medianewsonline.com/30963873610.pdfIn PDF document text
    • http://lobulezinovux.medianewsonline.com/loxobom.pdfIn PDF document text
    • http://befotuke.mywebcommunity.org/the_daily_trading_coach_review.pdfIn PDF document text
    • http://tapidiv.medianewsonline.com/ncert_class_11_biology_anatomy_of_flowering_plants.pdfIn PDF document text
    • http://jiteruruw.sportsontheweb.net/44180291108.pdfIn PDF document text
    • http://remoliwagofaju.mywebcommunity.org/nowogolejeperiguriwoko.pdfIn PDF document text
    • http://titoto.xyz/examen_de_excel_avanzado90k4z.pdfIn PDF document text
    • http://paxezot.getenjoyment.net/zilifakazazetawaz.pdfIn PDF document text
    • http://redit.fun/where_to_buy_avon_skin_so_soft_lotionxgreg.pdfIn PDF document text
    • http://xevamoz.mygamesonline.org/8463434836.pdfIn PDF document text
    • http://it50save.info/kamojavadazozipasagarexsd7s9.pdfIn PDF document text
    • http://alphabitx.com/jijowasuxowekuxixiwurifex90u3f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0efdb04f-128a-4c0d-ace4-8b312723ebcc.filesusr.com/ugd/5508f4_d3ce365ef0f84d1581820a3a5d912746.pdf?index=trueIn PDF document text
    • https://17a6c5a8-0587-4adf-8126-5b439e15a62f.filesusr.com/ugd/54bec1_7462647db5794f7a881ff74745a59504.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/51fde241-f8cc-4179-9658-c026b34aadfc/in_what_order_should_you_watch_sword_art_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06bd63cb-b21a-4b59-9003-6890d44d4d43/what_size_drinks_does_sonic_have.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/771a5f02-2e0b-4c19-896e-f1014c796d58/hp_officejet_j4680_wireless_setup.pdfIn PDF document text
    • https://c534e673-b245-4a6d-8787-855fe96db707.filesusr.com/ugd/e19215_e9588b2a04554c1399a0b5f7214b70a2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/122be4c6-b00d-4426-ae19-629fd65986ce/67923683501.pdfIn PDF document text
    • http://bavotuvezomevi.myartsonline.com/63333132703.pdfIn PDF document text
    • http://rivenoke.onlinewebshop.net/serotonin_agonist_and_antagonist.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA0 5148 bytes
SHA-256: 728f0a6bd90c119818f2f4cd91f8924848b146cb3319bda9bcc2825a54b64594
font_01_sfnt_off00010f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2F 11288 bytes
SHA-256: 32849e200ba1bed67e6f53ce5d6a14fbcc05f19b480ee297629ca805e532ecfb