Malicious PDF — malware analysis report

Static analysis result for SHA-256 243d2a37d203950c…

MALICIOUS

PDF

46.5 KB Created: 2020-11-07 11:11:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 345a4fc65e9316cc5f88087f651cbda3 SHA-1: d227ce6027dbaa360d11e09f468d064be957c52d SHA-256: 243d2a37d203950c5ce969b40b4ec50f0a0f5ebc0802ed3c975b39e5abc61839
196 Risk Score

Malware Insights

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

The PDF document contains a high number of external links, many of which are associated with a brand-impersonation credential phishing lure for Microsoft. The document also contains a payment redirection lure, suggesting an attempt to trick users into changing payment details or sending funds. The ML classifier strongly indicated maliciousness, and the presence of numerous links points towards a link farm or a downloader for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://vekaluledezo.weebly.com/uploads/1/3/4/2/134235689/xefunovaziregebak.pdf.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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://trafftec.ru/123?keyword=the+use+of+computers+in+accounting PDF link annotation
    • https://vekaluledezo.weebly.com/uploads/1/3/4/2/134235689/xefunovaziregebak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462350/normal_5fa20a9f7fd2c.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/rurup.pdfIn PDF document text
    • https://nidixinaxob.weebly.com/uploads/1/3/0/7/130739699/198001.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390328/normal_5fa5896fa9f27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382418/normal_5f8ea71268780.pdfIn PDF document text
    • https://vajemedodumuni.weebly.com/uploads/1/3/4/3/134351385/jozabe.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://uploads.strikinglycdn.com/files/3754e972-7f1c-4695-bced-67d6bf91eaf6/junonegofuwetotexumeb.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/diwupobejowonanuji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02989604-ca7a-4323-8add-56610503f0e9/78747674103.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/22731728661.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/21967085079.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/63548583524.pdfIn PDF document text
    • https://s3.amazonaws.com/dazutun/sobusuluxuxopodurutekiti.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/vibojitetufusazi.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_off000068b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68B0 5228 bytes
SHA-256: bf24f60d9552618d5b3990399da01cf874d39a5a8964170ca277fd0b3927d302
font_01_sfnt_off00007a5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A5A 10792 bytes
SHA-256: b33c7546554adc7dfaf8593db1fc04e942bfb26583709d53fb2b41f67933ee89
font_02_sfnt_off00009f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F0C 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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