Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f7978c267e69a7f…

MALICIOUS

PDF

77.5 KB Created: 2021-06-11 06:35:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4cf8c90ea6e8cbe6ee341f3a08252834 SHA-1: 9852567101764307c4105b26246f8bd497283103 SHA-256: 0f7978c267e69a7fa70f3bd444553df251d624ef0403dc65e2cdff7280a2711b
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 0.9996

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://smidgel.ru/pbw?utm_term=happy+birthday+aww+song+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417315/normal_604b9dee29906.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366364/normal_6042f20df3d8e.pdfIn PDF document text
    • https://bageriwiko.weebly.com/uploads/1/3/2/8/132814239/464983b7b.pdfIn PDF document text
    • https://gofadoden.weebly.com/uploads/1/3/4/6/134615513/fetulijemobulesoves.pdfIn PDF document text
    • https://jexiliwole.weebly.com/uploads/1/3/0/7/130739190/3686034.pdfIn PDF document text
    • https://panemomozig.weebly.com/uploads/1/3/4/5/134503052/fafofibuzi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416332/normal_602a2de28ee88.pdfIn PDF document text
    • https://binenivav.weebly.com/uploads/1/3/4/5/134516867/tevulageveza_tikujenutuk_besidedos_fizedemufoze.pdfIn PDF document text
    • https://gokejaxax.weebly.com/uploads/1/3/6/0/136056436/jexeguto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426421/normal_60446c73550b2.pdfIn PDF document text
    • https://pewenotevis.weebly.com/uploads/1/3/4/5/134597539/89e13f8a95abc7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dojejezo.pbworks.com/w/file/fetch/144803739/how_to_get_a_5_on_ap_calculus_ab_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d4f6472-9624-4d6e-8663-783ca886983e/how_to_read_a_carotid_doppler.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be2ec281-1dd8-4ee8-a0fb-03aaacb3f352/1900260249.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64c77ac8-5458-4cc0-a2b5-5d9b9bade2f6/dashcam_viewer_3.1.2_registration_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d315ced-12c9-4a63-a3c1-f069e048eda6/19342333864.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9eea8bdc-91d9-4e4a-aeec-588df3594ca4/tugelajanunekivuzomejorex.pdfIn PDF document text
    • http://gazoridixilu.pbworks.com/w/file/fetch/144919068/kekesip.pdfIn PDF document text
    • http://nubuzefi.pbworks.com/f/stacey_lloyd_macbeth_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aee872a-d91a-4076-affb-c72a6bad25d2/libro_harry_potter_5_pasta_dura.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3082906c-10b5-4f91-992c-594a83886ed3/how_do_you_know_when_you_feel_the_presence_of_god.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f95ac71d-3cd1-436f-99a1-f4c98f42a8e4/ps4_controller_wont_charge_just_blinks.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_off0000eee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE1 5516 bytes
SHA-256: eb5a3209c2d28a85cdec052720bd60d4cb452129430f4e94f00c369cb88d786a
font_01_sfnt_off000101a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A6 10964 bytes
SHA-256: 7e2ffd4c4662594a6d3209c4513e065f4ee0d497de30c732da53e7120918a5f8