Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c42c2f703e349c…

MALICIOUS

PDF

74.4 KB Created: 2021-03-17 18:22:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: cc9dc7ca34309b75ece86372835347e2 SHA-1: d2422d416e4ec8e168c9de98f15ccd137cea82ac SHA-256: c8c42c2f703e349cd3c165cf770d50e53688989fe62f4c5ebedc2870f7e1b6f1
186 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 high likelihood of malicious intent. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. One prominent URL, 'https://bologen.ru/strik?utm_term=me+before+you+watch+online+free+english+subtitles', is presented in a way that could deceive users into believing it leads to free movie content, but it is likely a lure for phishing or malware distribution.

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://bologen.ru/strik?utm_term=me+before+you+watch+online+free+english+subtitles PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4466154/normal_601db86367330.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370309/normal_5fd67c45b76a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375700/normal_5fd08fe755b19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466664/normal_60378282172b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485163/normal_601d4caef0943.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://992bddda-184d-467f-a815-0165b41a2208.filesusr.com/ugd/69695d_1b61113a491b4b9b999b45dfac29b71c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jusuberu/wallpaper_4k_windows_10.pdfIn PDF document text
    • https://c8a164a7-2549-4056-b209-d27d417f800b.filesusr.com/ugd/136d3d_500b8fca28aa44da954366dc32b300db.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/kekefamabowululomigejetip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f33a02d-42cb-453e-9e67-ea8c231376a4/osha_flammable_storage_room.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fea6b314-ab6a-47d0-a789-c8d9fdceb6e0/putilobejixufinefubapojil.pdfIn PDF document text
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_8d9dd375fbde401da42276fe1d6ffd8b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/93f34d02-9779-4425-a767-89dfd98e1619/how_to_stretch_your_foot_before_running.pdfIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/wall_street_journal_prime_rate_history.pdfIn PDF document text
    • https://b5526579-b22d-45a0-8251-9885a72cf3eb.filesusr.com/ugd/0cd019_40eb94f605104b7bb3636eb274aad57f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/mubodexugavapa.pdfIn PDF document text
    • https://2ddf8be6-044d-4f30-b6fd-16c032829cd6.filesusr.com/ugd/9827ea_71b830d53d23407999defeb4a152341a.pdf?index=trueIn PDF document text
    • https://a91873a8-1f5b-4151-915d-af39eb211f25.filesusr.com/ugd/3f80ec_396d4caa83724cd181816c1b87e98b1a.pdf?index=trueIn PDF document text
    • https://aed022ca-8a9d-452d-9022-56a74a585a14.filesusr.com/ugd/4d548e_9fe65756bb8846fb86bc91fff23249e5.pdf?index=trueIn PDF document text
    • https://a3720f92-bdaa-4449-a3ff-14f36884d2d5.filesusr.com/ugd/afadc3_3172831c0c414e48ac7a9c5d60850dca.pdf?index=trueIn PDF document text
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_2b220f7ae7c44faba3a3e7fa8ea0ccaa.pdf?index=trueIn PDF document text
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_7c878e08d6af47d89fec38ec5c7b0827.pdf?index=trueIn 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_off0000e620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE620 5480 bytes
SHA-256: 70cf5571ec498054a6b604d2745121ec8f03170ee63415c584698b49e4b70412
font_01_sfnt_off0000f8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EA 10264 bytes
SHA-256: 47657bf5a56cd23a8d95edfd3361bde30c9fe579b982180d173a60e18733f294

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