Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a93146dac8af974…

MALICIOUS

PDF

75.6 KB Created: 2021-04-04 18:28:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: da80b7b89a0d28ddd3a5dcd608e0f96a SHA-1: 57dbda835fbb207a0ef9f14f54d639b530359e39 SHA-256: 0a93146dac8af974035d978d4e0e2376dd41e3d40cb7e0385473134ee04577eb
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 0.9998

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://fokemale.ru/award?keyword=foundation+of+abstract+mathematics+pdf PDF link annotation
    • http://zaparipajomigi.scienceontheweb.net/algorithms_to_live_by_download.pdfIn PDF document text
    • http://tanivikovome.sportsontheweb.net/auckland_suburbs_map.pdfIn PDF document text
    • https://jujokubibafa.weebly.com/uploads/1/3/4/6/134621517/puzemekoj.pdfIn PDF document text
    • https://vaturelola.weebly.com/uploads/1/3/4/7/134704713/gikivepuso-zuturelotovis-wavurosawima.pdfIn PDF document text
    • http://pirunumilusarib.sportsontheweb.net/81883109128.pdfIn PDF document text
    • https://zigepavozaw.weebly.com/uploads/1/3/4/3/134349437/73268630d.pdfIn PDF document text
    • http://tomokatixo.mygamesonline.org/axis_bank_blue_chip_fund.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/free_vpn_for_pc_psiphon.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/balance_sheet_example_ib.pdfIn PDF document text
    • http://mujasanowagug.epizy.com/neriposowotozag.pdfIn PDF document text
    • http://lusajafimaneru.myartsonline.com/922005358.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a628c1e9-b079-480c-9ed9-23f5e54f256a/sawenigonirupoko.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/sadlier_vocabulary_workshop_3rd_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f9d47f4-0898-4deb-b1af-3f72c20a14ec/66140079200.pdfIn PDF document text
    • http://xazawipobu.rf.gd/attentiveness_character_first.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34fd34a8-c37e-4905-b477-809916beb88d/my_hp_5520_is_printing_blank_pages.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_off0000e8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EB 5460 bytes
SHA-256: 3b5bb58448cf7fa66d297187314c36d967e4068028c3b7eaa22e5e0a06bd9a2a
font_01_sfnt_off0000fb4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4E 11044 bytes
SHA-256: 8035aea1bb05d03c36b9a9ebf1fc4c1d336020ef0c7b5df23e195c9a66aeccea