Malicious PDF — malware analysis report

Static analysis result for SHA-256 377639a5499f6b4e…

MALICIOUS

PDF

78.9 KB Created: 2021-05-16 01:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e71039e888e604f68d69edee63b820fe SHA-1: 94b62b1f6e595c64f6c5ba45b71043580260bdc8 SHA-256: 377639a5499f6b4e631a8b724b57509d606caef5574f356100c22cc4892f9b8f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' and another flagging it as a 'Phishing Trojan'. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded document body, though truncated and obfuscated, suggests a lure related to geography themes, likely to mask the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/strik?utm_term=what+are+the+5+themes+of+geography+and+their+definitions
    • http://nelitip.22web.org/what_is_a_navy_seal_exercise.pdf
    • https://cdn-cms.f-static.net/uploads/4446645/normal_603b70b8708f6.pdf
    • https://cdn.sqhk.co/lasanamemego/hjiiLCw/bodufetex.pdf
    • https://dotolisode.weebly.com/uploads/1/3/4/6/134616401/796784b4165ee9.pdf
    • https://cdn-cms.f-static.net/uploads/4425487/normal_60566a5474469.pdf
    • https://cdn-cms.f-static.net/uploads/4447658/normal_601a484332ad6.pdf
    • http://zawizazoxof.iblogger.org/all_football_live_scores_news_apk.pdf
    • https://xekijepomi.weebly.com/uploads/1/3/4/5/134508866/7821944.pdf
    • https://static.s123-cdn-static.com/uploads/4366630/normal_5fef9cba8dc86.pdf
    • https://forilulan.weebly.com/uploads/1/3/1/4/131408022/74482c77d6c.pdf
    • https://cdn.sqhk.co/xewimoziwuvo/dPibZw3/superhero_creator_free_online_marvel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vufupu/79960425636.pdf
    • https://uploads.strikinglycdn.com/files/291d8812-edee-444a-b3d0-dce5e14a553d/best_free_to_play_zombie_survival_games_on_steam.pdf
    • https://uploads.strikinglycdn.com/files/4dc036e5-c777-4134-92b3-1c64946f418b/33710499561.pdf
    • https://uploads.strikinglycdn.com/files/7f9ccc74-aeca-4129-acbd-bf6086e0b4e1/52794559381.pdf
    • http://givemuzod.epizy.com/population_census_2011_nepal.pdf
    • https://s3.amazonaws.com/tozaduliwubega/man_sings_golden_girl_theme_song_tiktok.pdf
    • https://uploads.strikinglycdn.com/files/28d77c77-04fc-409f-b292-18d8b9ab2faf/bissell_powerforce_helix_model_1240_manual.pdf
    • http://delezomixotu.epizy.com/dawn_of_titans_latest_apk.pdf
    • https://uploads.strikinglycdn.com/files/2f7ec5ff-d18e-40d0-a6bc-3dccafeea5a3/xivagajejonawopowepu.pdf
    • http://jazoxuxorilule.epizy.com/55744088266.pdf
    • https://s3.amazonaws.com/fonazuzixagizir/sample_accountable_plan_template.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3fa.bin
b1927a520e64cfb7e610b1b94659bc927558d89958ce2872ec498eda159223e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FA 5660 bytes
font_01_sfnt_off00010725.bin
abb1514f1d8497d41c8d9eef1c2b3d28fcf79ad477dcb536e60fd3bca99fa4cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10725 10832 bytes

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