Malicious PDF — malware analysis report

Static analysis result for SHA-256 b337c1c02bd14693…

MALICIOUS

PDF

117.7 KB Created: 2021-05-29 23:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 71e72ada5815e94b933db6206ecc0d43 SHA-1: 3efbaa2ad5665a3920c028a4c0baa16a5af775a1 SHA-256: b337c1c02bd14693ed698d995bd08133d26a955f113ecf10b001e8e395c246f5
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, and includes a UTM term that suggests a search engine lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The embedded links and the nature of the heuristics suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pelibifir.ru/strik?utm_term=rig+veda+sandhyavandanam+sanskrit+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4409610/normal_6009ab25504ae.pdfIn PDF document text
    • https://kumobavogi.weebly.com/uploads/1/3/2/3/132303339/796145.pdfIn PDF document text
    • https://kumevilowe.weebly.com/uploads/1/3/4/5/134598600/sumefovegefel_zuvig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446259/normal_604b315092eb6.pdfIn PDF document text
    • https://zavetogodafewer.weebly.com/uploads/1/3/4/7/134709275/sabiwinusekuvom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501961/normal_5ff52581d54a1.pdfIn PDF document text
    • https://tulopudegiwidal.weebly.com/uploads/1/3/0/7/130739196/dozemopulikig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447640/normal_5fe971e3a676a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426945/normal_5fc6b4162662f.pdfIn PDF document text
    • https://bajiwemijowulu.weebly.com/uploads/1/3/5/9/135990815/kefobaxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376362/normal_603540a03870a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420240/normal_605011e375d2c.pdfIn PDF document text
    • https://baletepo.weebly.com/uploads/1/3/0/7/130776023/8741150.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374835/normal_604b2baa38911.pdfIn PDF document text
    • https://jipukikibowema.weebly.com/uploads/1/3/4/6/134633032/jeboxe_dugabu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371786/normal_60589fc26e411.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403141/normal_5ffd6d84758c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478669/normal_6033ab1b10531.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/f7de2968-a137-4604-86c0-b8e10a8da97b/how_much_does_a_consulting_manager_make.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e731b79e-0557-472b-9050-7d222d24915f/28727391635.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5d4b317-983d-4d70-8ae8-dde63e4e19e1/pumofalorupovox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aad8a0c2-217c-43f5-9273-83bc91e9d1f1/derechos_de_estados_unidos_mexicanos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91506c9a-499d-4216-a84d-479728284efd/epson_workforce_3640_error_97.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000179d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179D9 5656 bytes
SHA-256: d7921ea083951a6010ce846fc5eaae7f1ba095d473ba0923e527930a126692fa
font_01_sfnt_off00018d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D0D 11180 bytes
SHA-256: e24e062e6e040d08391babee2bbb546f90348fe6ee83d9398ec75b17a13e5d0a
font_02_sfnt_off0001b39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B39A 16164 bytes
SHA-256: 6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3

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