Malicious PDF — malware analysis report

Static analysis result for SHA-256 832444ba929e9039…

MALICIOUS

PDF

88.6 KB Created: 2021-04-03 21:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3b39d9a8eaac0d00fa154a51bfbbcdc7 SHA-1: 57beaaa14bab877dcc1868e73cf13cc8abd6fbc3 SHA-256: 832444ba929e90393c797aba152ea860acce2b55cdd61c134af6b208b5fc6a11
186 Risk Score

Malware Insights

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

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 0.9989

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/award?keyword=shunryu+suzuki+beginner+s+mind+pdf PDF link annotation
    • https://mefixakiderix.weebly.com/uploads/1/3/4/3/134319494/196994.pdfIn PDF document text
    • https://pimitasemoz.weebly.com/uploads/1/3/4/6/134646318/mogutubabidu-kifutito-kanojixijoxu-tulidisowezubu.pdfIn PDF document text
    • http://likedizar.medianewsonline.com/how_do_i_reset_my_funlux_camera.pdfIn PDF document text
    • http://tryse.xyz/how_to_get_3000_calories_a_day_vegetariancp3jo.pdfIn PDF document text
    • http://sowipilarow.mygamesonline.org/cursive_letter_worksheets.pdfIn PDF document text
    • http://madewithsunshine.com/265693413642xgap.pdfIn PDF document text
    • http://muzomabavima.medianewsonline.com/difference_between_autecology_and_synecology.pdfIn PDF document text
    • http://figejewumoposes.getenjoyment.net/colloquial_arabic_levantine.pdfIn PDF document text
    • http://eliyalte.com/bisezizigelexetasn4ccf.pdfIn PDF document text
    • https://bepixumute.weebly.com/uploads/1/3/5/3/135302933/2b21e2b.pdfIn PDF document text
    • http://larts.digital/tda2030_amplifier_circuit_diagramjz7ka.pdfIn PDF document text
    • https://jividakole.weebly.com/uploads/1/3/6/0/136090299/pufuvopu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://6f465708-eb37-4ee2-8658-ebeec6cd93ea.filesusr.com/ugd/4bb103_c582a3b51926405da40b180d91498a3d.pdf?index=trueIn PDF document text
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_6909b676f8bf437693c79d081679a19d.pdf?index=trueIn PDF document text
    • https://28546a20-d0cc-4b82-bb4f-6711990cd5a3.filesusr.com/ugd/0bcf16_848aa360c03743acbfc0deae9cd91578.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/90077bb2-deb3-491d-a971-64219ce261a6/86714220093.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3f01668-e0fc-4d89-bbf6-9783123a5b76/72636279152.pdfIn PDF document text
    • https://9e1b5e4e-b4ab-405b-8fdf-b3b6d7b19c28.filesusr.com/ugd/94ea38_c996ea8eb7ce469c8362d313dce9b63a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fab8395d-3dc6-49b2-83a5-3b342e35bd5c/80208661216.pdfIn PDF document text
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_a88e100f36454625b243148b762387fc.pdf?index=trueIn PDF document text
    • https://e905e09d-7ddd-4aab-833c-73500e817873.filesusr.com/ugd/f4c08b_dadefd8ca28040bd861ddebed337048a.pdf?index=trueIn PDF document text
    • https://d78d2789-9aef-4bfd-88be-9093bec910ef.filesusr.com/ugd/87a178_fe2fcf07ab23480988350fdfd1f05da5.pdf?index=trueIn PDF document text
    • https://3a5aa097-47f9-475f-9992-83bceef25cc3.filesusr.com/ugd/f55bec_650403b6740742dab88a47b1bd269e25.pdf?index=trueIn PDF document text
    • http://widusop.atwebpages.com/what_is_the_advantage_of_k_to_12_curriculum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/870568d3-47b3-4052-9014-cdf1a3018bb1/8383558479.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://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10463 5672 bytes
SHA-256: 38f88bad0b32e00270654da3fd9aab915b99a118cf6064ceefe48b068d7001c5
font_01_sfnt_off00011789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11789 5872 bytes
SHA-256: ec7fd114f93e4b9024c0ab82d885d37240a3598320dc1a98170ff19b37121a76
font_02_sfnt_off00012686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12686 16776 bytes
SHA-256: ed6f7f5a4fca358db0c23bf911a7810d6a7888551fbb2b48a3a049de59ab06c0