Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cfa01422d5ddf93…

MALICIOUS

PDF

91.0 KB Created: 2020-12-26 14:14:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9a31fae9a2be863564aafe75deb01cf8 SHA-1: 84b6684a998d691bac38a1c5dca6003d23a2e618 SHA-256: 3cfa01422d5ddf93a84ef128c33fdb6a4cc63a0b5d04c156d2a65cc0d3c5f31b
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a high ML score. The file contains a large number of embedded URLs, suggesting it is part of a link farm or phishing campaign. While no scripts were explicitly extracted, the nature of the embedded links and the ClamAV detection indicate a phishing or malware distribution attempt.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/strik?utm_term=ecruteak+city+pokemon In PDF document text
    • https://cdn-cms.f-static.net/uploads/4443814/normal_5fae1c28268f7.pdfIn PDF document text
    • https://rifijilaguselud.weebly.com/uploads/1/3/4/8/134846829/9508138.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368229/normal_5fa8dd153e411.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469370/normal_5fdead69e535d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376619/normal_5f9942b9dc6f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530070/normal_5fdfca86775ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368469/normal_5fae2831d6064.pdfIn PDF document text
    • https://guxedujigizos.weebly.com/uploads/1/3/4/7/134735137/3623874.pdfIn PDF document text
    • https://warobakun.weebly.com/uploads/1/3/4/4/134486798/9763157.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sezutuma/shoot_timer_remote_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a58068d8-10d9-4511-af24-f3dd7c470cc9/sidasorukivedevixinob.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/skyrim_se_belt_fastened_quivers_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c84a191b-6177-4455-9a66-aaad42c4ee6d/star_wars_embo_action_figure.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0E 18804 bytes
SHA-256: 8e96fefa6b3b30b4c300fd399de012caefbd293d79a301aeb1b1440d10ffd1b8
font_01_sfnt_off0001267c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267C 4992 bytes
SHA-256: af664eb8593e7fc349c0d8912aeb8b9bec3a9c58a484a5bfe8d567a4db47f14a
font_02_sfnt_off00013775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13775 11964 bytes
SHA-256: b48ffa17167638c5955828a281b5aea11cf99c834ac52d4de91b54e2b7cb8b09

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