Malicious PDF — malware analysis report

Static analysis result for SHA-256 b903df0d46d59df4…

MALICIOUS

PDF

76.7 KB Created: 2021-03-12 20:32:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 696ec4dbd9eae97d32e8508c6eb5099d SHA-1: 24ea99af2d3231678d0cb0cd6164df6aa4e4bea3 SHA-256: b903df0d46d59df4fe8ca8e502ed6113da4272b9df2bf5f4bd32c064cbfd36d0
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF documents. One of these links, 'https://xezojetit.ru/123?utm_term=lonely+planet+bali+guide+book', suggests a potential phishing or malicious content distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/123?utm_term=lonely+planet+bali+guide+book
    • https://cdn-cms.f-static.net/uploads/4487641/normal_5fda20b3b7aa2.pdf
    • https://kuximakid.weebly.com/uploads/1/3/0/7/130739256/juginoxukune.pdf
    • http://creditscorehelp.info/beautiful_disaster_jamie_mcguire_barnes_and_noble9ippa.pdf
    • http://govnososal.xyz/firefox_older_version_for_windows_102sf3h.pdf
    • https://guxesawaxogego.weebly.com/uploads/1/3/4/3/134314991/sevoputupijavog.pdf
    • https://kagilomit.weebly.com/uploads/1/3/4/6/134669997/zojokenixote.pdf
    • https://static.s123-cdn-static.com/uploads/4485445/normal_5fedd2909a2e3.pdf
    • https://cdn-cms.f-static.net/uploads/4484126/normal_60362e52f3cc0.pdf
    • https://cdn-cms.f-static.net/uploads/4476569/normal_604966ebc5243.pdf
    • https://static.s123-cdn-static.com/uploads/4367644/normal_5ff928317cda6.pdf
    • https://static.s123-cdn-static.com/uploads/4378607/normal_5fc623efe374e.pdf
    • https://static.s123-cdn-static.com/uploads/4383156/normal_5fcca8e471036.pdf
    • http://ejinaya.com/sipubozubusox70ye.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/58600947-c324-44fa-8c81-736ed55b77aa/hoover_power_scrub_elite_pet_upright_carpet_cleaner_reviews.pdf
    • https://uploads.strikinglycdn.com/files/ad536985-9b51-4e9a-8ae0-93353208b3ca/ielts_general_writing_task_2_sample_questions_and_answers.pdf
    • https://uploads.strikinglycdn.com/files/b2f32bfb-b603-4fe3-91ae-c85a6eef2683/74379788176.pdf
    • https://uploads.strikinglycdn.com/files/e92b28be-28a9-40fd-9f29-db3d0553843b/skyworth_55-inch_uhd_android_tv_55suc9300.pdf
    • https://uploads.strikinglycdn.com/files/84f25eea-6657-4d85-9186-90170475a80d/22309908606.pdf
    • https://uploads.strikinglycdn.com/files/e3089cf7-22b4-41c7-8f11-2306c1039205/civil_rights_timeline_on_the_u.s_between_1920_and_1950.pdf
    • https://uploads.strikinglycdn.com/files/dd1f2df6-d01a-4470-9364-3b6907cf8ca7/vunedogepezeviluvokati.pdf
    • https://uploads.strikinglycdn.com/files/fc24c634-d008-4fa2-bf69-ddd35ebc16ef/tonul.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2a2.bin
af37e545405571a283b9b5fd0feff2af62ae43b6cecf2164d276a9bc8a3f88c0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A2 4980 bytes
font_01_sfnt_off0000f3ad.bin
966aeac7593036880e862568124e9165a7f6addc582abea0bbe79e0c7f8bf578
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AD 10344 bytes
font_02_sfnt_off0001170e.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x1170E 4324 bytes