Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b6357b04ec78ad…

MALICIOUS

PDF

84.3 KB Created: 2021-04-02 05:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5ebb1313394355f06377cfe259953672 SHA-1: 45f646110324163d5e2fc335b66766d209361880 SHA-256: 40b6357b04ec78ad1f2ed12e0b11379fb0e0754bdc39b64372eda9af2573dca6
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 0.9995

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://crophysi.ru/wix?keyword=imagenes+de+la+sagrada+familia+de+nazaret PDF link annotation
    • http://cabinetsop.xyz/samsung_bd-c5500_remote_codejhwar.pdfIn PDF document text
    • https://cdn.sqhk.co/vaminika/e0dghj4/bunny_book_club_questions.pdfIn PDF document text
    • https://cdn.sqhk.co/lebuxexofe/jhdjjMQ/tetokesugijepa.pdfIn PDF document text
    • https://cdn.sqhk.co/wosipuvetot/iehdniu/geriburavug.pdfIn PDF document text
    • https://cdn.sqhk.co/sativomofij/gdUriaR/burax.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwoxebu/Xighhjh/download_zombie_district_mode_in_pubg_mobile.pdfIn PDF document text
    • http://presalon.xyz/jetawigivurew0yxy8.pdfIn PDF document text
    • https://cdn.sqhk.co/wabasenenem/AfihzzB/sexojadejidafusu.pdfIn PDF document text
    • http://goproits.com/396375599393uu67.pdfIn PDF document text
    • https://cdn.sqhk.co/kikolibub/JCEgjJB/30571720708.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b595a6f9-6bcb-48d8-acfc-7cb8c696cf55.filesusr.com/ugd/21f311_d3c17a95316e44e9938e5740d8aa21a3.pdf?index=trueIn PDF document text
    • https://76bf42c0-7447-45ed-8dd3-33f9786ae3ae.filesusr.com/ugd/ba2c19_93f2b419e387424cb978657378378159.pdf?index=trueIn PDF document text
    • https://1580f21e-fc75-4350-9669-3be8b7525729.filesusr.com/ugd/eff6cf_eb4156f19183408393a5225fa3705804.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/67f18e40-e4ba-4c5b-96ad-f41372f961f9/nikon_d40_battery_charger_price_in_india.pdfIn PDF document text
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_9f9b0b4dfc0b47a58e24548527b40e2d.pdf?index=trueIn PDF document text
    • https://1f2f8e77-98df-4c5e-b88a-83bc2b612b58.filesusr.com/ugd/5c7528_a1c58be41cb040a28664d87c1c805cfc.pdf?index=trueIn PDF document text
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_0b72a307b26b463bac67f16049446a30.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8c4cc6a-e784-4581-9c54-be95c6ab47a9/is_breville_a_good_brand_for_microwaves.pdfIn PDF document text
    • https://c3438639-6a75-4920-aa4f-d1e0b619354f.filesusr.com/ugd/3be3a7_9d1c8b412bfc4994813bbc39f1893385.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/486ca6b0-c32a-4c00-b664-e92e4ded855b/66264945323.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9163e20a-647b-41c2-a1ff-4de406f50179/dating_scan_accuracy_at_16_weeks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/311538e5-976d-4f8c-a8b2-9d880aae0b94/what_does_envision_mean_antonym.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADE 4044 bytes
SHA-256: 3c2d1770e9962a3b3be09b40cd635f53e349b106ee1be702ce198ffae6d83d14
font_01_sfnt_off00010940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10940 5212 bytes
SHA-256: b7e1865f623f8847349a1cdadc387faeaace2299462d65ecf08bc7921658f930
font_02_sfnt_off00011ae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE7 11944 bytes
SHA-256: 3f225182407df8f58571cae8b05fdae3e7af61a06a594d44d7ffbab93d71cad8