Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa8513cb31706ec…

MALICIOUS

PDF

75.0 KB Created: 2021-04-07 08:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4ec29aabad40d018d6d86321d148a2d5 SHA-1: 585d707d3b7fc65eb7f771d4c73e61ac665eb529 SHA-256: 8fa8513cb31706ec67eba298dd625db2aa1d50b390384d508ac448f48d230cba
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm for SEO purposes. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/wix?keyword=emilia+othello+character PDF link annotation
    • https://jupagefux.weebly.com/uploads/1/3/1/3/131398252/tesiviroz_dowuzopib.pdfIn PDF document text
    • https://pasezarovatif.weebly.com/uploads/1/3/4/8/134858127/7461931.pdfIn PDF document text
    • https://vetinuvejozijuk.weebly.com/uploads/1/3/4/7/134745319/eb82a80c.pdfIn PDF document text
    • https://regujume.weebly.com/uploads/1/3/4/3/134339948/5868192.pdfIn PDF document text
    • http://fumizudo.sportsontheweb.net/hp_laserjet_3055_scanner_driver_for_windows_10_64_bit_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/61ea206e-cabd-420d-a826-79cc2889514d/27407082050.pdfIn PDF document text
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_3b34746b0b8d486db5bc75462d5d985b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/930043d2-acf3-45c9-ae52-36c9ec5fbf80/what_is_the_disease_als.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dac193eb-3d4a-4cf3-b0c5-50fde00aaabd/98377126495.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1a10dc4-928b-4063-b280-210f686c3afd/tedatixuraruwigad.pdfIn PDF document text
    • http://sipanokule.onlinewebshop.net/agricola_tacito_latino.pdfIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_6c41a1574ad14754b8996f10532dbbdf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/mamas_and_papas_moses_basket_waterproof_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/gelopexa.pdfIn PDF document text
    • http://zasuwunal.myartsonline.com/control_system_theory_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80af197f-ff1d-467a-98ff-dec6953cf8cd/58733975907.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37e0ed57-f531-49c5-8e2e-2e76293dd870/pifesurowurusitesojewovir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/827b4840-33fd-43b6-8cb5-5e2d07097b65/manual_pedaleira_digitech_rp80.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54d00c3b-8f44-485a-a2c6-0674176761d8/how_to_find_the_domain_and_range_of_a_piecewise_function_graph.pdfIn PDF document text
    • https://9d349da1-218b-4b59-9e37-2a90cab56d40.filesusr.com/ugd/de9003_d5e3c4c2fcdd4b7693fefd5a88412b52.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/70286627-a758-4ad4-85a6-9f2b13e720b1/watch_a_scanner_darkly_online_123movies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ca604b2-3385-4abe-a221-b137dd110390/80364407912.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_off0000e989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE989 4820 bytes
SHA-256: c14d1a0e5931c054ea4e425105e5bc83ac1d0c02d2aba2aee8f4d748de19d336
font_01_sfnt_off0000f9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BC 10768 bytes
SHA-256: 4e74d1c925284df436e3ca32035dd4f46a78a446ff24e4d4a71455ba9eed9086