Malicious PDF — malware analysis report

Static analysis result for SHA-256 b84c4eacefe291cd…

MALICIOUS

PDF

82.4 KB Created: 2021-05-24 13:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba9393b3300680cd95135dc107097cc7 SHA-1: d14f56b9be1c1e5cbd84e71e1a1ea787149e4756 SHA-256: b84c4eacefe291cd22a803339e5cded8eade1d89e11108de80d0492a1da1e292
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many of which point to other PDF documents, suggesting a link farm designed to obscure the true malicious destination. The primary malicious URL identified is https://jottigo.ru/strik, which is likely used for phishing or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jottigo.ru/strik?utm_term=is+acupressure+covered+by+insurance
    • https://cdn-cms.f-static.net/uploads/4417824/normal_6019f21cd9716.pdf
    • https://nituxokijawagez.weebly.com/uploads/1/3/0/9/130969825/f3123f19995cfd.pdf
    • https://kiragidemi.weebly.com/uploads/1/3/0/7/130775435/dukax.pdf
    • https://cdn-cms.f-static.net/uploads/4380675/normal_606b873e5f7fc.pdf
    • https://fozumazajafipal.weebly.com/uploads/1/3/4/5/134588547/2687560.pdf
    • https://cdn-cms.f-static.net/uploads/4452148/normal_6012882493b6d.pdf
    • https://cdn-cms.f-static.net/uploads/4414849/normal_605596689c3b3.pdf
    • https://tosoremekik.weebly.com/uploads/1/3/4/7/134771766/bupemalobezega-zimosadod-guwaxi.pdf
    • https://cdn-cms.f-static.net/uploads/4451047/normal_5fe872a13d345.pdf
    • https://votopugukoz.weebly.com/uploads/1/3/5/3/135315446/000fc.pdf
    • https://xegezutiraviral.weebly.com/uploads/1/3/0/7/130775125/wotamepupil_pivamisaf.pdf
    • https://lififotepul.weebly.com/uploads/1/3/4/3/134339298/jilix.pdf
    • https://vevilatibivu.weebly.com/uploads/1/3/6/0/136082609/witugigagiw-xajopazax-fovovikele.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fa773359-6f58-4b70-906b-1c004cdff6ae/what_is_stub_in_soap_web_service.pdf
    • https://uploads.strikinglycdn.com/files/e4139c61-90cf-43b0-9022-0fa10cd5dbed/crossword_puzzles_online_free_printable.pdf
    • https://uploads.strikinglycdn.com/files/de73fcfe-5aa5-476c-872c-eeb081d2894f/is_narnia_4_coming_out.pdf
    • https://uploads.strikinglycdn.com/files/6bb9c3f9-a556-42c2-a0d2-a53f9bacca27/zinedaxolunugabamud.pdf
    • https://uploads.strikinglycdn.com/files/36117070-5e27-4a62-a4ea-c842fba13445/1100_words_answers.pdf
    • https://uploads.strikinglycdn.com/files/7e98bce9-321e-4671-9219-c9462faf77b8/7138559765.pdf
    • https://uploads.strikinglycdn.com/files/86859e9d-a8b5-46c4-af2c-6a8f353ba005/is_the_paleo_diet_good_for_eczema.pdf
    • https://uploads.strikinglycdn.com/files/e9ea5e6d-93eb-4cd6-8635-a23bb0ecbe85/70955685598.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102b6.bin
d6151f452eb62213e44c426074d42de55ed9a09b30ecbfea2849478989449bcf
pdf-font-stream PDF embedded font (sfnt) at offset 0x102B6 5272 bytes
font_01_sfnt_off000114ba.bin
3c7ff36382e81493782c4f0f4223f14bed9738c8a34e909b0b3a1eec7f0748a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x114BA 11060 bytes