Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f30bc50563f6e2b…

MALICIOUS

PDF

98.1 KB Created: 2021-04-05 16:37:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d551f6b921142544ba145ff7692e183c SHA-1: e7da068d2246be3546cd413275dd53ef33d1a547 SHA-256: 6f30bc50563f6e2bdd1f01646aca779e090111244d20a070d1f6eca540682f28
186 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, with a significant number of embedded external URIs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links, including one pointing to 'druttle.ru', suggests an attempt to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://druttle.ru/award?keyword=ethical+principles+in+educational+research+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413702/normal_5ff8de899dccf.pdfIn PDF document text
    • https://daregunomunozo.weebly.com/uploads/1/3/4/7/134723938/1483073.pdfIn PDF document text
    • https://bubunixijasebed.weebly.com/uploads/1/3/1/4/131407035/9dc2cc24e079e10.pdfIn PDF document text
    • https://roguraluvi.weebly.com/uploads/1/3/0/7/130776180/dezenerewetowopurudu.pdfIn PDF document text
    • https://vomuzubedabop.weebly.com/uploads/1/3/0/9/130969103/dijuwupokuxesunew.pdfIn PDF document text
    • https://jevebuna.weebly.com/uploads/1/3/4/5/134594548/dogebovogejesol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446490/normal_5ffb821899e41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408004/normal_600bf89297ccb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489241/normal_605a68e66128f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502439/normal_5ffc15d7363c3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://43dda2ad-fadc-418c-a2d5-4b96cca2ed60.filesusr.com/ugd/6eca9c_25e684d70fcb420c97bf0ace60766c66.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7f29d6e-0a05-4090-b4b3-edc21b4bbbd7/twilight_series_download_in_hindi_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/34071371165.pdfIn PDF document text
    • https://5d9de69b-f80b-44d6-9c2d-9027806fef0b.filesusr.com/ugd/e26ad2_bcee323c970c4a2bb1f719ccb2d7827f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/79467631-c773-445a-8703-810e55e947d3/38796675476.pdfIn PDF document text
    • https://7ae774ad-b64d-4473-a0b1-aa0db1e39e83.filesusr.com/ugd/3e7897_7781c227b6b94313980dd980fc1a2fb6.pdf?index=trueIn PDF document text
    • https://54957a25-093b-4cbd-a4f0-8eb5fea931f0.filesusr.com/ugd/8ba634_2c419b3e09e84842899e24ecee250b17.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/el_nombre_de_jesus_es_poder_letras.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/cido_estearico.pdfIn PDF document text
    • https://8eb0ff2f-1b5f-41fb-a82b-bf279dc7f43e.filesusr.com/ugd/868f76_76d0c2e69f84420f9eaf7f1e16b25be5.pdf?index=trueIn PDF document text
    • https://2dc0326d-ac60-47d8-bf46-f2dc9d334570.filesusr.com/ugd/21b4a7_ae6af4799a0a49e0bf1025ece7da54e6.pdf?index=trueIn PDF document text
    • https://1e438cd7-6f3b-42ac-a97b-d13a75fa135b.filesusr.com/ugd/0c268c_cb36a018d80748c694b5ed2994f1be88.pdf?index=trueIn PDF document text
    • https://c18d7360-3707-4bf1-9d6f-52ba7510fa17.filesusr.com/ugd/76cb06_ce2ee0abf37e4ed7b04e032d3595543a.pdf?index=trueIn PDF document text
    • https://e905a76e-7bc1-418c-be29-e8eda1603e86.filesusr.com/ugd/3fb32a_8dea486f22a14775b8653b5c8e79ec01.pdf?index=trueIn 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_off00014333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14333 5200 bytes
SHA-256: c7765842bac8aa5dfc1e5f3bf01dff7fb83c19879b8850547137071773e06aa8
font_01_sfnt_off000154de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154DE 11164 bytes
SHA-256: 1e4d4a44af383fa9fde8847cc19229473c83f4b69b41f97460e84e8c9cb459e2