Malicious PDF — malware analysis report

Static analysis result for SHA-256 e75755525e7fdcbb…

MALICIOUS

PDF

116.0 KB Created: 2021-04-03 16:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: e2219dae4ae48540ca4105dfe488d15b SHA-1: b106ca7e170291c4bd17a4fb3fc1ccfd84bcd981 SHA-256: e75755525e7fdcbb3aec32a6b5f9b5a5350afd6a829a6dcebae1c84b4cc0ae7e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files, suggesting a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • 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://nipisod.ru/aws?utm_term=advanced+composite+materials+for+aerospace+engineering PDF link annotation
    • https://dofewomal.weebly.com/uploads/1/3/4/5/134510420/votikib-xozoxam-gelamug-tokofamamonuvox.pdfIn PDF document text
    • http://ruvaruvifovuk.iblogger.org/40659036543.pdfIn PDF document text
    • https://cdn.sqhk.co/mimofeto/eD28ZCU/wifi_password_recovery_pro_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/viwedanej/Xuojh7X/jadoxizanurepolimafido.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402507/normal_5fec79e444220.pdfIn PDF document text
    • https://mozepuboxiwagu.weebly.com/uploads/1/3/6/0/136094106/78a4c.pdfIn PDF document text
    • http://logekolumo.22web.org/how_to_remove_voice_search_from_google_chrome.pdfIn PDF document text
    • https://dibumofum.weebly.com/uploads/1/3/5/3/135313591/8872701.pdfIn PDF document text
    • https://cdn.sqhk.co/suwixowefa/aQxhjha/lezugija.pdfIn PDF document text
    • https://cdn.sqhk.co/lubometusoz/cjghcji/jolikodirun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495391/normal_600caa641aeeb.pdfIn PDF document text
    • https://cdn.sqhk.co/nufomewo/gwhfghI/sonny_bono_and_cher_married.pdfIn PDF document text
    • http://fiduwil.iblogger.org/pawoxomukisomeranuzidef.pdfIn PDF document text
    • http://kekanavaresem.iblogger.org/namita_agrawal_all_bhajan_song.pdfIn PDF document text
    • http://nidikasuzarola.iblogger.org/meron.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://s3.amazonaws.com/fuvidokibet/nanixedusomufirezas.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/pabemokoxovafawutuparudoj.pdfIn PDF document text
    • https://s3.amazonaws.com/gogunabones/57214979685.pdfIn PDF document text
    • http://perepidowowavam.epizy.com/learn_portuguese_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/first_amended_complaint_form.pdfIn PDF document text
    • http://rifukaleriduji.rf.gd/lorokedopu.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/oxford_word_skills_intermediate_free.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_off00017825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17825 5312 bytes
SHA-256: 11a2748db1cf64c8ba5fdfbeddc8012f9acd526a14f7699edbc75334bf8f5648
font_01_sfnt_off00018a12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A12 12172 bytes
SHA-256: b2cb7e6c93c8f505c989a4870b5466065c0ea41ed77f81b9317e1c19811b5d43
font_02_sfnt_off0001b1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B1BD 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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