Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a114c9c7082050a…

MALICIOUS

PDF

69.4 KB Created: 2021-06-10 17:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c03b671ba068dd64a6a3b79c43b97acb SHA-1: a37cbb569799a60217d044397440a3d4c1008dfa SHA-256: 6a114c9c7082050a92f7dd1672f065b7c430d5afca9f9dfad8ae002e43a5e1b4
184 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, characteristic of a link farm designed to direct users to potentially malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8144

Heuristics 5

  • 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
  • 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://huntic.ru/pbw?utm_term=the+binding+of+isaac+afterbirth+unblocked PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465255/normal_603d3f6dcd583.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422645/normal_601a02338c4b5.pdfIn PDF document text
    • https://birafuwufejutik.weebly.com/uploads/1/3/4/5/134598964/fe927be9b.pdfIn PDF document text
    • https://popuverixi.weebly.com/uploads/1/3/1/4/131438274/femud-likuj.pdfIn PDF document text
    • https://noxolawozin.weebly.com/uploads/1/3/1/4/131452883/5679925.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4403539/normal_60b23f996abb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422378/normal_5fdb38c4ce104.pdfIn PDF document text
    • https://bumaxaxup.weebly.com/uploads/1/3/4/2/134235918/wumizuforajebugusaje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.thdl.org/http://www.thdl.org/TibetanIn PDF document text
    • http://betosaxugawi.pbworks.com/w/file/fetch/144469617/bejokufigafigiru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80cc71f2-eb57-4a76-860f-64939806db29/temelokedofawapadojo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b0c303c-f2a9-41d8-b639-9333c0ce1642/dazevaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/385bc455-26b3-44b6-b6e6-89217147dbcb/zoxekitatevavazifu.pdfIn PDF document text
    • http://fipivuzigoge.pbworks.com/w/file/fetch/144424401/mizowezan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bdff0fd-222d-4130-a317-d79d633c9476/conversational_english_topics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81ad7844-9f84-4e97-ae11-4f24d70a4746/65643439605.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36def8ef-2a1b-41ab-9e8d-5411469768cd/python_programming_for_dummies_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96d9d67a-f0ac-4373-ba91-126b4dcc8d3b/foluwejevinepebajaken.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f9013bf-ae49-4503-baf6-57f9710f2394/why_subscribe_on_twitch.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/f/how_to_get_25_000_robux_for_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cf5a232-4bd3-4126-8c9e-320fc3b563ee/83186395225.pdfIn PDF document text
    • http://magogopowo.pbworks.com/f/mr_dieingly_sad_sheet_music.pdfIn PDF document text
    • http://pitavumiza.pbworks.com/f/aprender_coreano_grtis.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlTibetanIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08D 2968 bytes
SHA-256: 7ce0b3924d6ce8b280f7682b0c9aaa535fbfe2d55b6fc43cf16b6d7ccb29147b
font_01_sfnt_off0000eb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB21 5436 bytes
SHA-256: 82e79662a40e63a18d719c2e219315a75d8d64fb4f4d47dfcae59b3f978a9a3f
font_02_sfnt_off0000fda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA0 8904 bytes
SHA-256: 3791412462341bc546155723b24bf67472bb9bcfc57cb17b600505a7dcb7469a