Malicious PDF — malware analysis report

Static analysis result for SHA-256 caa8e1c604434080…

MALICIOUS

PDF

43.5 KB Created: 2020-11-09 10:17:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: a015ca6ac437abd17a20e9f8ffe985a5 SHA-1: 168af1ee8083620800837a9bfae8a6cb6042bd10 SHA-256: caa8e1c6044340805e6ba22056133902792dea71b2e8ee05b9b8f89b529a9d2d
66 Risk Score

Malware Insights

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

The PDF document contains multiple embedded links, one of which points to a suspicious URL that is likely part of a phishing or redirection scheme. The ML classifier strongly indicated maliciousness, and the document body's content suggests a lure related to tax vouchers. The presence of numerous links, many hosted on disposable domains, further supports a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://trafftec.ru/123?keyword=nj+2020+estimated+tax+vouchers PDF link annotation
    • https://tumixivig.weebly.com/uploads/1/3/1/6/131636813/pizuxedemeviberidiv.pdfIn PDF document text
    • https://fadefewili.weebly.com/uploads/1/3/4/3/134316521/nipuxed-voroxugapabiv.pdfIn PDF document text
    • https://jubunukaf.weebly.com/uploads/1/3/1/4/131483214/556a8.pdfIn PDF document text
    • https://tibirodemoxojuf.weebly.com/uploads/1/3/4/3/134336787/gafizid_kenufaj_zupija_kesulu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://lodoxepal.files.wordpress.com/2020/11/reremuradivuvevedivogobid.pdfIn PDF document text
    • https://rovizira.files.wordpress.com/2020/11/34109145170.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/532c964f-f181-4699-a39b-d30d9b7f90ef/26020859144.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/79152833930.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/xaxupomikaxunus.pdfIn PDF document text
    • https://zufavenasefu.files.wordpress.com/2020/11/ableton_live_10.1.1_keygen.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/71779548503.pdfIn PDF document text
    • https://s3.amazonaws.com/sodoxi/java_web_services_certification.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/fudesijizitiviwupixano.pdfIn PDF document text
    • https://pevolitu.files.wordpress.com/2020/11/viguzafomewejanefu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/985eed7c-6736-4183-860a-e7374480e0fc/haplogroups_and_race.pdfIn PDF document text
    • https://rirabizujito.files.wordpress.com/2020/11/a_clash_of_kings_audio_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A59 5596 bytes
SHA-256: 24c48a444f5964999c322039c7c8cc93ccce63b69b4fdb680ee97e4687852941
font_01_sfnt_off00007d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D44 10444 bytes
SHA-256: 929682456f08e7a1608d7ac6307aaedc2b5aa52f6006df4146451c1a5403030d

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