Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdac9eb646123573…

MALICIOUS

PDF

49.6 KB Created: 2020-11-06 03:43:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c1b20676377a041bc0b12d4eb0e536a4 SHA-1: 9457f4ba50da926d7a0a00edf5419719b27dfbfa SHA-256: fdac9eb646123573ff3fb1f827c6b5b9efd6a48dbf552cf56c21f9bfab43bb51
74 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffset.ru/aws?keyword=martin+reilly+memory PDF link annotation
    • https://xeludopoveju.weebly.com/uploads/1/3/4/5/134528604/c360ba7b49e1ad.pdfIn PDF document text
    • https://jinunezig.weebly.com/uploads/1/3/4/3/134308797/d16c55ea52d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369665/normal_5f920fd04aad8.pdfIn PDF document text
    • https://defelewag.weebly.com/uploads/1/3/2/7/132741475/2427572.pdfIn PDF document text
    • https://woliwejimagevin.weebly.com/uploads/1/3/4/3/134319070/3904044.pdfIn PDF document text
    • https://zokagagewawo.weebly.com/uploads/1/3/4/3/134346606/zafevufotewolo.pdfIn PDF document text
    • https://muwegejise.weebly.com/uploads/1/3/4/2/134265646/zilif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390996/normal_5f913164891ad.pdfIn PDF document text
    • https://topodomero.weebly.com/uploads/1/3/2/6/132696018/mitop-mikusibus-fitesofikirog.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://cdn.shopify.com/s/files/1/0430/9689/9745/files/empalmes_de_fibra_optica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dea50fad-9f1b-4a97-ac1f-e245c46c2545/sozizijawakanezulenose.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8269/7889/files/sof_olympiad_trainer_apk_free_download.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_off00007497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7497 4548 bytes
SHA-256: 93d3be8e7bfeb33e0fbfc54fc5d1536ff6d3dcfd3ead281e54ca2a806be6f66f
font_01_sfnt_off000083ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83ED 11224 bytes
SHA-256: efeb7d9b2b62914e1bcf4daecb664d5810b7d59e3ee33322faf4fcc2d62060d9
font_02_sfnt_off0000aa68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA68 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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