Malicious PDF — malware analysis report

Static analysis result for SHA-256 a085993017772952…

MALICIOUS

PDF

88.9 KB Created: 2021-04-04 03:39:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ad60023a0452c2601e810bba61b0c6a SHA-1: c8ebd1d85f6f7be5b5e649a16af8b804103264a1 SHA-256: a085993017772952fb624489733f3d2f5b0aa82c269f50351e870fd4aabea6ab
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, flagged as a link farm, suggesting a malicious intent to direct users to potentially harmful websites. The ML classifier and ClamAV detection strongly indicate malicious content, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure itself facilitates the embedding of these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://baarspo.ru/123?utm_term=wow+bfa+alchemy+guide
    • https://cdn.sqhk.co/piredonina/HCigibl/redujitegumiga.pdf
    • https://cdn.sqhk.co/roratumopiv/hhgdgjV/robots_coop_mod_apk_unlimited_money.pdf
    • https://cdn.sqhk.co/letarezetap/Cm9jfWu/13324013923.pdf
    • https://cdn.sqhk.co/vavapezami/hCjitgh/zinejomujovatifu.pdf
    • https://cdn.sqhk.co/gefeloxo/cjbibPb/99418329233.pdf
    • https://cdn.sqhk.co/derebeduno/4jeijXq/susowasokalojuposidoka.pdf
    • https://cdn.sqhk.co/zitajazasu/hsjdvgj/how_to_speak_real_english.pdf
    • https://cdn.sqhk.co/gapalagabig/iQiij9r/wildlife_rescue_near_me_bunny.pdf
    • https://cdn.sqhk.co/gumojitoxowu/idhbjgf/7_minute_workout_app_free_download_for_android.pdf
    • https://cdn.sqhk.co/kivipemo/yUjhOie/kidafodalatariforinoporeb.pdf
    • http://bovewowi.iblogger.org/cbse_online_school_history_form.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://73f4d879-981c-49fe-abc7-520f36a14a84.filesusr.com/ugd/b77b08_b8075106127a466b93ad388b04f07ec7.pdf?index=true
    • http://pegufokaki.epizy.com/10th_maths_guide_free_download.pdf
    • https://uploads.strikinglycdn.com/files/cb7f0493-75be-44fc-92ff-d80a9cb5a47a/what_kind_of_oil_does_a_2012_lexus_rx_350_take.pdf
    • https://uploads.strikinglycdn.com/files/a6170faa-9039-4ae6-b045-d3df78a2a196/73024739416.pdf
    • https://ddd59a73-be73-4575-bd7b-2e5900175f8b.filesusr.com/ugd/5dc0ef_d7420f6a0a7d405aa9afadcd7d4b3d32.pdf?index=true
    • https://80f75f89-a1e3-4611-a0ef-7a704eb82da9.filesusr.com/ugd/0286dd_68cf8edbd82a4f1ea1de21417adad8d6.pdf?index=true
    • http://kemopix.rf.gd/medical_terminology_for_health_professions_7th_edition.pdf
    • https://uploads.strikinglycdn.com/files/285c547b-dd1e-49d5-8482-2ecd725e2bab/dowozufifud.pdf
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_039b23751a9d4f36aa94502d42d92c84.pdf?index=true
    • http://faxunarin.epizy.com/old_man_at_the_bridge.pdf
    • https://s3.amazonaws.com/dixaleko/monejinilajurokadowivi.pdf
    • https://s3.amazonaws.com/lolaritemukole/sivesofizamolevowolutimab.pdf
    • https://uploads.strikinglycdn.com/files/ec62f625-c07b-4f1c-841b-98394322b3ca/foberexi.pdf
    • https://uploads.strikinglycdn.com/files/adcd1022-d137-40f0-a109-31164c01d2da/19243527411.pdf
    • http://podapuleleg.epizy.com/accidents_reported_today_york_pa.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_off00011244.bin
20215d9f4815311813365fe4e2520567783ff567fd077931c0e744a94a719d5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11244 5204 bytes
font_01_sfnt_off0001241b.bin
04e070e432559c217e5506a19ae28b8a6aa8205cf0a10473cd43b8dc48608d2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1241B 10556 bytes
font_02_sfnt_off0001483f.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1483F 4324 bytes

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