Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1328198ce8a76f4…

MALICIOUS

PDF

76.8 KB Created: 2021-06-07 12:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 48119fc620daf8cf3d2287382a0723a4 SHA-1: e0652fdbc683232dae3428a51c7e23efd9416ad6 SHA-256: d1328198ce8a76f452d79872347dd304dc21e0f38011706d1039cd1d1c1180f5
226 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The heuristic 'SE_REMOTE_SUPPORT_LURE' indicates the document content likely instructs the user to engage with remote support tools, a common tactic for social engineering. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://drafthe.ru/pbw?utm_term=change+of+designation+letter+to+employee PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4405652/normal_5fcce70bf313c.pdfIn PDF document text
    • https://gowajepev.weebly.com/uploads/1/3/4/9/134900038/wenoj.pdfIn PDF document text
    • https://rinixupikexem.weebly.com/uploads/1/3/4/0/134096042/suwazotutol-nubaxafipepu.pdfIn PDF document text
    • https://jaragamonobuwuf.weebly.com/uploads/1/3/5/3/135346236/62df331.pdfIn PDF document text
    • https://bajekilirevi.weebly.com/uploads/1/3/4/8/134868337/6439599.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447096/normal_6039a2dacf5c7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469350/normal_5fca7f928a967.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e0f82ef9-02c4-4794-bb53-bc6c964dbea7/how_much_does_the_ipod_nano_6th_generation_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46828cbe-e0fb-4f92-8fd8-9199d4c250f2/oster_compact_toaster_oven_air_fryer.pdfIn PDF document text
    • http://tarogifere.pbworks.com/w/file/fetch/144676836/84641739717.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62ed761d-ccd0-41ea-a742-ff8a56109765/a_time_to_kill_book_ending.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cb52dec-8cb4-47da-b896-a448e38dc302/dsc_1832_partition_programming.pdfIn PDF document text
    • http://larabefejaji.pbworks.com/w/file/fetch/144520956/budget_analysis_report_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/941e7fd8-f834-4291-963e-55c375b528d8/tuwekekunu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b13899ac-44a4-491e-8563-2786ff5ba691/tournoi_de_poker_live_calendrier_2020.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_off0000e20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20E 5368 bytes
SHA-256: 37ecf1afb3b44b45badc7a9e7a6c312c4fe3dbd5a44f6c9e4e55d0b1617f1e4a
font_01_sfnt_off0000f429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF429 10384 bytes
SHA-256: 4ef3d8befc931ac6f75df1dd447ab23e5ada47b385fb8f89f40532e4848daf44
font_02_sfnt_off000117a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A7 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c