Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8989149fe090f27…

MALICIOUS

PDF

78.0 KB Created: 2021-03-28 05:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: cdec5770d6782ed0ad0af3f4523b75b5 SHA-1: 9419563cd02d6b573d366b42019a5570ef845320 SHA-256: c8989149fe090f2782cb411dfb30d0ee84f69252f58925e5f45017635041d4df
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. The heuristic firings point to a large number of external links embedded within the document, suggesting a link farm or redirection scheme. The primary external URI, https://ponafet.ru/strik, is likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://ponafet.ru/strik?utm_term=radio+thermostat+ct+50+exclamation+point PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475209/normal_6027d82a50b5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476015/normal_602de4b573e27.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefima/tjdOiao/4620673861.pdfIn PDF document text
    • https://fixemebipufuw.weebly.com/uploads/1/3/4/1/134131586/f5d8510dd042272.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455684/normal_6040fc873118b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421209/normal_5fe73f316c67e.pdfIn PDF document text
    • https://vuminuzatadabem.weebly.com/uploads/1/3/4/3/134311796/loxaxovixoxul-mujizesug-kufimujulaso.pdfIn PDF document text
    • https://cdn.sqhk.co/pebekaja/8jcfghj/belly_button_piercing_places_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475392/normal_6052cf8e5289a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403823/normal_5fef45589947b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379476/normal_605a1aff41978.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457000/normal_603fba130a2b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476943/normal_6053c068233c8.pdfIn PDF document text
    • https://nuravodabola.weebly.com/uploads/1/3/0/7/130740537/danodopetik_pupilufibe.pdfIn PDF document text
    • https://cdn.sqhk.co/jawafurovif/91giKig/hitman_3_ps5_price.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/6f73a725-fec1-48ac-9b58-e1aab9c90de6/m-audio_keystation_88es_driver_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d85218a1-8305-4b7d-bc3a-9caefc8b9264/workforce_2630_not_printing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff92ac74-558d-4d61-b5d4-edf37beb650f/98611891071.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/178fc46e-e685-408b-8b09-7d2188042659/what_is_the_latest_version_of_aci_318.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_off0000f119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF119 5656 bytes
SHA-256: e494c6754a59e37641e90a2adb4d06fb51ec01a8f79f59336709699abab5d71a
font_01_sfnt_off00010431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10431 10964 bytes
SHA-256: 12720437e3e35efb57f748e2413dfdf49f48cacaf6cb6e1bee92ebbc9be9e75e

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