Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb116875a1b11cb8…

MALICIOUS

PDF

84.7 KB Created: 2021-05-30 23:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1878e70d1a719a0c9a5375704df3f144 SHA-1: 71385a6f9ef82757701a2daba429ed6757e69280 SHA-256: fb116875a1b11cb80df3776aa0124c74d770d2931aa8e5d14dc0391c968eb560
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and 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 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://dugedepap.ru/123?utm_term=engineering+leveling+guide+wowhead PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4475737/normal_5ffa24a6d469e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385434/normal_6020a6398f2f3.pdfIn PDF document text
    • https://golisoni.weebly.com/uploads/1/3/1/4/131437826/folokere.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4387706/normal_60afe479d5323.pdfIn PDF document text
    • https://suzefajadovu.weebly.com/uploads/1/3/4/5/134592553/namosa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456685/normal_5fddb71e97503.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417032/normal_5fefa23fb4994.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495251/normal_605a6ed90dc6e.pdfIn PDF document text
    • https://modurofeg.weebly.com/uploads/1/3/4/3/134376635/wexufo.pdfIn PDF document text
    • https://bivajeliju.weebly.com/uploads/1/3/5/9/135978375/c660e3384.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419826/normal_6048c8a6dc0bc.pdfIn PDF document text
    • https://numibogag.weebly.com/uploads/1/3/4/3/134323011/kizufizoweno.pdfIn PDF document text
    • https://xefakebeka.weebly.com/uploads/1/3/5/9/135993821/a2908706.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369189/normal_5ff26bbfb4117.pdfIn PDF document text
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/vufurafakuna.pdfIn PDF document text
    • https://galafiki.weebly.com/uploads/1/3/4/3/134347291/medefamupefom-zelepuginifura-zosalulepakomiz-gamoka.pdfIn PDF document text
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/931827.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416790/normal_6010096be2f86.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/df847f6d-b9ad-468d-8269-6326dffe66e8/65724893370.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8cef806-90eb-4777-bdf2-c5824ddcabb5/what_does_a_power_distribution_engineer_do.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4af8aacd-19f8-44f8-8a43-274e3fce5c0c/patitutigoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13a5d6d2-3c48-453c-a68b-10cfaca00f07/how_to_remove_nutone_range_hood.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/446f27ee-477d-4aff-8e48-daf78c340c89/kambakkht_ishq_full_movie_download_720p_filmyzilla.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_off00010bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCB 5020 bytes
SHA-256: 955dae44908a75a5afcc7a2808285660b79d1a39025b0b1b1d02ff5a6ad350f2
font_01_sfnt_off00011cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF4 11940 bytes
SHA-256: 7e6cd652f5f16e79a6fcaae15a505f4b3517d60e2f80ecc914cce9883442764d