Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b58de42a1b617eb…

MALICIOUS

PDF

46.5 KB Created: 2020-11-05 22:00:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: fb17870e285f09af8ccc67f964f22c02 SHA-1: bd2832c1839b4aa6d173c4c57e429d0bd0d49a63 SHA-256: 3b58de42a1b617eb5a7ce1b7f57d5589721ff00901b4e808d35c86eb4a6f2aca
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://trafffe.ru/123?keyword=retirement+planning+spreadsheet+mac PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403685/normal_5fa245f0903c9.pdfIn PDF document text
    • https://bavejojonosepes.weebly.com/uploads/1/3/1/3/131380601/9865678e0364.pdfIn PDF document text
    • https://pisanofinupu.weebly.com/uploads/1/3/1/4/131437881/597cad04.pdfIn PDF document text
    • https://bavejojonosepes.weebly.com/uploads/1/3/1/3/131380601/lileresajelo-tesidonumove.pdfIn PDF document text
    • https://tabogivazosepa.weebly.com/uploads/1/3/1/8/131871767/1ab7d5995e84a.pdfIn PDF document text
    • https://juxupadozimufa.weebly.com/uploads/1/3/4/3/134388451/2176739.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380531/normal_5f8c0c0fc2b39.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/sorogamat/xatalupewapirove.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/undergraduate_econometrics_textbooks.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/36686473205.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/ziwawebelepexalim.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/plc_book_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/novena_a_san_judas_tadeo_da_9.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/logic_2020_album.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/transfer_amazon_gift_card_balance_to_paypal.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_off00007550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7550 5496 bytes
SHA-256: f6f88b4da8ee9481acefde7754743e9261be8c6474c391ea5b567b582b37d122
font_01_sfnt_off000087d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87D2 10892 bytes
SHA-256: e6e1aeb0ab1cae752d28c09f517bb6761f2fba20fe50a0f6fb075a9317253c41