Malicious PDF — malware analysis report

Static analysis result for SHA-256 79ce1f8b49eae532…

MALICIOUS

PDF

80.0 KB Created: 2021-03-12 13:43:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9ab94b5f91b5be9746587bf978ac8763 SHA-1: 8f7ca180b3ab47dd2652d52b025adfb72226dd36 SHA-256: 79ce1f8b49eae53280f3e84d0e5ce646f177056fa0c8f1744b4d74591e83cf1a
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains and potentially malicious content, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or a link farm designed to redirect users to harmful sites. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xajibur.ru/wix?keyword=vocabulary+workshop+level+f+unit+6+synonyms+answers PDF link annotation
    • http://kuxogajow.iblogger.org/96417253239.pdfIn PDF document text
    • http://winoraama.website/cant_eject_disc_from_ps4cpwjx.pdfIn PDF document text
    • http://studyweb.site/the_legend_of_zelda_links_awakening_dx_rom_gb_espaolx9xya.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_4af61d7576604a1d8648244b0a0f5a85.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/mathematical_formulas_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a496042b-fea3-43ae-9045-a9cbdc7f7adb/80588882925.pdfIn PDF document text
    • http://jerananixakuzeb.epizy.com/41839622030.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/70774379886.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22823fbc-7d40-408f-82bc-879c6023c9f8/74732781513.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c748e5cf-f7a9-4efe-a0c4-87bae4b32690/dd-wrt_router_vpn_server.pdfIn PDF document text
    • https://0a497e50-07dd-462d-832d-d8678f741a8e.filesusr.com/ugd/5f857b_4d1d68c2c90a4d68bb24e41c4ade0a9c.pdf?index=trueIn PDF document text
    • http://lipidojomodu.rf.gd/radioactive_decay_problems_and_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8063e1ae-70eb-4b89-a8b5-488b00cfd308/is_grant_writing_a_good_career.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da8052ba-efd6-4fee-8086-14ac514eb259/how_to_open_a_worcester_boiler.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d703e18-d31a-4e17-bb4a-0d994302aa9d/33888917355.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/where_did_industrial_revolution_began_first.pdfIn PDF document text
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_f9eb1d7cda3b4b97925b763242aac38d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/562b0b2c-81d7-4e0c-9693-5b0d3f161043/what_two_colors_make_sage_green.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2a04a2c-1341-4769-b6f2-4425f500233f/64744734430.pdfIn PDF document text
    • https://c36efdde-2309-4ce2-a10d-b6df2ce12cd8.filesusr.com/ugd/e98059_eb7c1e68fbc445d4945583595adbbb05.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/154dd26c-bd0a-4abe-9b47-e4277bdff895/vector_calculus_identities_proof_index_notation.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_off0000f8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AC 5832 bytes
SHA-256: acfc44f76f0dae93e9471756c42961f5bbf647d95eced4ef8802d68f625b5110
font_01_sfnt_off00010c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C80 11092 bytes
SHA-256: f9704e71e901a14a2b8ebafdf60f9f2f6ce1d9c3d92c9503587ff8466f3702c2