Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1143fba50de5e52…

MALICIOUS

PDF

74.7 KB Created: 2021-03-19 13:25:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e69dc64b3b0ff451bf7ed9d46d08e8a SHA-1: bee808a392432b16391969f7215dd4ccc1b7db67 SHA-256: a1143fba50de5e5212051fa7619e339dfc949e364eb5f500b519248323886688
164 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are disguised as educational materials, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dafemum.ru/strik?utm_term=5th+class+english+book+pdf+maharashtra+board
    • https://cdn-cms.f-static.net/uploads/4403960/normal_5fd7e2cad7d96.pdf
    • https://cdn-cms.f-static.net/uploads/4379236/normal_600a5a6c16af8.pdf
    • https://ranilabat.weebly.com/uploads/1/3/5/9/135999147/lotomu.pdf
    • http://kaxiwex.iblogger.org/48506201450.pdf
    • https://cdn.sqhk.co/jakufomego/WOsrdjs/49044832318.pdf
    • https://cdn-cms.f-static.net/uploads/4380680/normal_600be53da3ae5.pdf
    • https://cdn.sqhk.co/falugojafat/bhdic11/dual_universe_full_release_date.pdf
    • https://duzajitoji.weebly.com/uploads/1/3/2/6/132680922/4389660.pdf
    • https://cdn.sqhk.co/bimolixumotu/apihhgS/doofus_drop_mod_apk_android_1.pdf
    • https://cdn.sqhk.co/sadudolamom/hOr9jnp/twilight_struggle_asia_scoring_card.pdf
    • https://tigidejuremu.weebly.com/uploads/1/3/4/5/134502839/528652.pdf
    • https://cdn.sqhk.co/xulawajikigi/idBjcia/rustic_wood_wedding_cake_toppers.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/915d7865-b12c-458d-8cbe-9bc4c1d3336f/how_to_mix_phthalo_blue_from_primary_colors.pdf
    • https://uploads.strikinglycdn.com/files/e590bd4a-0e43-45ed-b9e6-74ebf9098688/99157910532.pdf
    • https://uploads.strikinglycdn.com/files/8393b23d-9077-4937-bcd5-c8426fa9bce5/pathfinder_adventure_paths_ranked_2019.pdf
    • https://uploads.strikinglycdn.com/files/7e005fa5-67c6-46f0-9c74-a3faedbc852f/bohemian_rhapsody_virtual_piano_sheet_easy.pdf
    • https://uploads.strikinglycdn.com/files/00baca28-dadc-4ce9-ab84-aac21381c53e/nijugisozuxijijipikiwaw.pdf
    • https://uploads.strikinglycdn.com/files/328fe0a6-98d9-4265-a6b3-0a8370e2660d/ledozed.pdf
    • http://jerananixakuzeb.epizy.com/aprilia_rs4_125_performance_parts.pdf
    • http://lozufifeme.epizy.com/pathophysiology_of_coronary_heart_disease.pdf
    • https://uploads.strikinglycdn.com/files/6fba5282-1e54-4b06-a33e-0d3268c44834/zigejuwesijipufejiponireb.pdf
    • https://uploads.strikinglycdn.com/files/58a8979d-3593-4da4-b935-73ab29d8acf1/what_is_cub_scout_motto.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_off0000e5d4.bin
836fb9897dc6a05bb88912fa6fb27a1dd62168f4734b901e1af754a3bc719ba8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D4 5800 bytes
font_01_sfnt_off0000f96f.bin
3d23fe39ea6914597365bb694a690d52a92bec43c621cfbdc1df4c9114dddadb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF96F 10360 bytes

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