Malicious PDF — malware analysis report

Static analysis result for SHA-256 298c3d5e4f722936…

MALICIOUS

PDF

73.5 KB Created: 2020-11-23 14:59:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0299e8b1881d86c800849f9888bbe027 SHA-1: 140259b4cef5f80c016a1c2e0f20b8b5071a6a4e SHA-256: 298c3d5e4f7229361ad668f030439c2d34515978b227c55b202585d7bd37d947
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The file contains a large number of external links, many pointing to S3 buckets and other domains, suggesting a link farm or SEO abuse for malicious purposes. One of the primary URLs, https://traffset.ru/strik?utm_term=witcher+3+swamp+thing, is directly embedded and likely serves as the initial lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://traffset.ru/strik?utm_term=witcher+3+swamp+thing PDF link annotation
    • https://besajovepew.weebly.com/uploads/1/3/4/6/134633036/fogis-mifeseketex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404964/normal_5f9f893aca716.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392218/normal_5fabb4d127e7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401505/normal_5f945c84ed755.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372702/normal_5f994e34ab30b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zamuriza/wixulenalojazaf.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/dozakututipasirutuveje.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/keto_meals.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec5a0aad-7ec5-4446-86f3-088ffd3bebfc/wow_shadow_priest_pvp_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/an_affair_to_die_for_subtitles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11ae8d09-b14c-44fb-9eb2-ef8e956b34af/cub_scout_leader_book_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b733703-daad-47f0-a10e-88c40eab4a9a/books_of_blood_volume_5.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_off0000d6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BA 5260 bytes
SHA-256: 2c9c60255e9838b044cc7a033c7db1632458e22c11baa920bd733f7d96316e3f
font_01_sfnt_off0000e883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE883 10380 bytes
SHA-256: c65b892de3eacb4abd0acfb78ad28d7592c66f5b42a703e052a3ee38e57251bf
font_02_sfnt_off00010bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC2 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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