Malicious PDF — malware analysis report

Static analysis result for SHA-256 15a93c256fec6301…

MALICIOUS

PDF

72.1 KB Created: 2021-03-15 18:44:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4860d076bde5eeefb018ac6b1e88dd1e SHA-1: bbc867bbca94f06cf89afa9fccfab8cf8208fac7 SHA-256: 15a93c256fec63014abe88e0bd82083e7acfdec6dafc9006ea11d01038577980
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest the document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=bash+script+get+command+line+arguments PDF link annotation
    • https://mutuwafidiz.weebly.com/uploads/1/3/6/0/136095616/1ea0868879e7e.pdfIn PDF document text
    • https://kuvolobogon.weebly.com/uploads/1/3/4/0/134012650/ritetimepowalum-jimukiwapo.pdfIn PDF document text
    • https://badosajag.weebly.com/uploads/1/3/1/4/131407507/45c935816f2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465538/normal_601d60c03af84.pdfIn PDF document text
    • https://vigenawora.weebly.com/uploads/1/3/4/4/134495248/8ba1f7e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371025/normal_6022af037e493.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477376/normal_602b12b138dda.pdfIn PDF document text
    • https://rozigakix.weebly.com/uploads/1/3/2/3/132303329/ninobemapuseb_puwedexu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475725/normal_5fe153528dff4.pdfIn PDF document text
    • https://kezagoguz.weebly.com/uploads/1/3/4/1/134131769/wavegimomasewon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444638/normal_60355b9d247c2.pdfIn PDF document text
    • https://puganijososas.weebly.com/uploads/1/3/1/8/131871778/puvid-kuwupeb-nugesexonozeto.pdfIn PDF document text
    • http://gidujoluj.mypressonline.com/76606969574.pdfIn PDF document text
    • http://ziwewixowele.sportsontheweb.net/relefazuxipi.pdfIn PDF document text
    • https://tasoxagizuj.weebly.com/uploads/1/3/4/7/134734804/tozamaranesopaxowa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402262/normal_5ff10598caa9f.pdfIn PDF document text
    • http://xexapitanegis.getenjoyment.net/how_to_reset_sentry_safe_factory_code.pdfIn PDF document text
    • https://pejilajapife.weebly.com/uploads/1/3/4/4/134477767/kisugukidedenus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bixozebaxikapos.atwebpages.com/top_100_business_ideas_in_nigeria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cd23e26-e27a-435a-ad6f-b42ea471310b/trail_tech_vapor_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48b88205-f8e9-4155-9fed-7981d266ce7d/spotted_lanternfly_damage.pdfIn PDF document text
    • http://pidodexogejax.myartsonline.com/mathematical_induction_proofs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54177572-8a6f-4bc1-a8dc-7e4941b3e50d/world_champs_lol_2019.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_off0000d738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD738 5536 bytes
SHA-256: 4a59c78a66263c5fd4c95721dfbf181ab0998b3acaaa70d51bd37261864f3c9a
font_01_sfnt_off0000e9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D9 11992 bytes
SHA-256: 1fc7bd7a66ed32ed2ec1b556259b8090609ed082b74d23b659b72dc8eb639542