Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22c2da9fb628cd5…

MALICIOUS

PDF

138.0 KB Created: 2021-03-29 10:19:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0e317e42b134a877db8ed51d7298a203 SHA-1: 229b77a885adbea59eb1b7b4cf85fd6b688c774b SHA-256: a22c2da9fb628cd5130647218716833b6db929ae39b74bb8712b358ad8eb248e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ClamAV as 'Pdf.Phishing.Trojan'. The ML classifier also strongly indicates maliciousness. The document body, though heavily obfuscated, contains keywords related to scientific principles, likely used as a lure to disguise the phishing attempt. The presence of external URIs suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 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://zajinet.ru/award?keyword=polymerase+chain+reaction+principle+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4487618/normal_605df9792f9cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417414/normal_5fe7db1aaf452.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450632/normal_5fe167822ab96.pdfIn PDF document text
    • http://zuzutogutid.22web.org/sikunediwuzepovoluropafu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392457/normal_60608b9de0a45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381740/normal_603e6a294d3d9.pdfIn PDF document text
    • http://segwaywheelchair.ru/jinujuravudovuvokizirtuegf.pdfIn PDF document text
    • http://firosujiw.iblogger.org/java_interview_questions_for_experienced_programming.pdfIn PDF document text
    • http://retexevaw.iblogger.org/nubozesojomipujozemum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495849/normal_5ffca58babea3.pdfIn PDF document text
    • http://blubadgehelp.net/textos_em_ingles_para_6_anobkbys.pdfIn PDF document text
    • http://kuzojud.66ghz.com/wabodone.pdfIn PDF document text
    • http://lovasosirukes.iblogger.org/mudevu.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/lolijexejomak/67006884049.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/31015433964.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/wojixoxadodev.pdfIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/python_kivy_android_app_example.pdfIn PDF document text
    • http://junulobexatini.rf.gd/63096335337.pdfIn PDF document text
    • http://debefataxa.rf.gd/12865065540.pdfIn PDF document text
    • https://s3.amazonaws.com/wutisigila/danowedamukasetuk.pdfIn PDF document text
    • http://momugegunimex.rf.gd/81570404490.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C988 5496 bytes
SHA-256: b79d791ad78d7dc2d86e566b8771f827ac2e272081eb0a3dfa8062e4f46592e7
font_01_sfnt_off0001dc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DC15 13020 bytes
SHA-256: 0aceefdfbb7bdfb1fe909b94863ea8a0d5c300ac9875eb2324153b34b740f75e
font_02_sfnt_off000205c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x205C5 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7

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