Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d5e3ec3351d76e8…

MALICIOUS

PDF

78.1 KB Created: 2021-03-23 03:17:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 84da486521ed15656ae0fe89be70f353 SHA-1: b2181da42f6af7852f4e40c8edf4f1ae76a61473 SHA-256: 8d5e3ec3351d76e80104ed65fb8032a27c8a43ac156f38efa07d67200731d801
184 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest a phishing or malware delivery attempt, likely initiated via spearphishing attachment. No scripts were extracted, but the PDF structure itself is used to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wix?keyword=the+roaring+twenties+worksheet+quizlet In PDF document text
    • https://cdn.sqhk.co/delotijuw/2bUhdi9/20298508404.pdfIn PDF document text
    • https://nitejaxerovon.weebly.com/uploads/1/3/1/3/131379530/a73057f1.pdfIn PDF document text
    • http://sungo1.space/parts_of_speech_worksheets_with_answers8fyfh.pdfIn PDF document text
    • http://pink-echo.club/dotexofijilisufatolerudoejmah.pdfIn PDF document text
    • http://milky-rp.space/niluriwaelt2c.pdfIn PDF document text
    • http://lunowizu.iblogger.org/5470984049.pdfIn PDF document text
    • https://sasikeruxet.weebly.com/uploads/1/3/4/8/134851076/a5fd0.pdfIn PDF document text
    • http://aslixan.com/nujogaluvosnq65.pdfIn PDF document text
    • http://noverst.xyz/82417299142xrkp0.pdfIn PDF document text
    • https://cdn.sqhk.co/wufevinek/chehf8x/among_us_avatar_maker.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
    • http://faxunininenif.epizy.com/mimoz.pdfIn PDF document text
    • http://siwofumev.rf.gd/43132935413.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/96501470454.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/kyrie_irving_injury_report.pdfIn PDF document text
    • http://buwobazakosujo.rf.gd/roruvizigafekididotalu.pdfIn PDF document text
    • http://ralopokizuneza.rf.gd/13969217417.pdfIn PDF document text
    • http://zitejilid.epizy.com/rawumugaz.pdfIn PDF document text
    • http://rodiwelivetekuf.epizy.com/vigenowanokopipu.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/57569038328.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_off0000e693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE693 5108 bytes
SHA-256: f8595a1aad43cf2c023135712c731204b6a8f7532f3f2b338c82482f2182b850
font_01_sfnt_off0000f805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF805 10912 bytes
SHA-256: cfe88145a90c55441d261f147e845508d78006a4b19be2789a198b7f9a3b5ef6
font_02_sfnt_off00011cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDC 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

Open this report in the interactive analyzer, or submit your own file for analysis.