Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f763b84224bf8df…

MALICIOUS

PDF

78.8 KB Created: 2021-04-01 21:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 2c60a16204d609fdd111255159b86f52 SHA-1: b1535bdb7535fecc0c0412131061cd3ed8b9f932 SHA-256: 8f763b84224bf8dfaf4e32b27e67491cbd7f4be6e139575f7847426cf8775647
214 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. Another heuristic flags a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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.
  • 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://crophysi.ru/award?keyword=art+of+action+pdf In PDF document text
    • http://xeratigike.medianewsonline.com/texutilonuxudiwuturaro.pdfIn PDF document text
    • http://watogoda.mypressonline.com/zogowenuzabufas.pdfIn PDF document text
    • https://rarerosedipise.weebly.com/uploads/1/3/4/8/134876587/3974906.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxizavex/gcchdcE/redezivi.pdfIn PDF document text
    • https://cdn.sqhk.co/vopupevomate/a7GfowQ/79532151145.pdfIn PDF document text
    • http://derilezin.sportsontheweb.net/nododowoxakozasilumus.pdfIn PDF document text
    • https://lolinukopo.weebly.com/uploads/1/3/4/3/134351434/vagotonediwem.pdfIn PDF document text
    • https://cdn.sqhk.co/jekunesoru/XCjgiiI/65649138512.pdfIn PDF document text
    • https://cdn.sqhk.co/toromerepowa/Ihgjgfg/dolujosomiwozen.pdfIn PDF document text
    • https://todilotifobaw.weebly.com/uploads/1/3/2/7/132712516/2593119.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/hallelujah_nuty_chomikuj.pdfIn PDF document text
    • http://vovojoj.atwebpages.com/apokryphen_neues_testament.pdfIn PDF document text
    • http://tipaduvorul.epizy.com/5196655064.pdfIn PDF document text
    • http://wadobenozunon.rf.gd/36787505970.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/34815502965.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/kixenivipavuga.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/usmc_silent_drill_platoon_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/abcd_2013_movie_in_hd_720p.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/netflix_app_for_asus_laptop.pdfIn PDF document text
    • http://dogibini.rf.gd/dolexekirewofugoze.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/involuntary_manslaughter_sentencing_guidelines_pennsylvania.pdfIn PDF document text
    • https://s3.amazonaws.com/xapota/silent_hill_4_endings_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/sizoxibaxexuji.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_off0000f89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89F 4928 bytes
SHA-256: b3de231543b889c4370af88501947bfcf3bdcb3f213bee4a62c472c85ac579f9
font_01_sfnt_off00010975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10975 10676 bytes
SHA-256: 79a51adcf2eb60357fe25926f79b1b70580a47cf065283292842df20d57c39d1

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