Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbd96e5cfc794045…

MALICIOUS

PDF

79.3 KB Created: 2021-02-15 14:53:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 39c5e9f83d1735518f57b84b5fc89c35 SHA-1: e16c33f77e12ab823f1379cd158c308d9a07a694 SHA-256: dbd96e5cfc794045f9d523a63ae3a7bd952daa34f8acacf00b68d31fbcfb6b8e
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/wix?keyword=dios+en+hebreo+como+se+escribe PDF link annotation
    • http://lidzadva.xyz/radicales_libres_cancervx2yr.pdfIn PDF document text
    • https://veguxalefimas.weebly.com/uploads/1/3/1/3/131382166/kosisuxonused_vutuferewik_lowifalaxuxixop.pdfIn PDF document text
    • https://cdn.sqhk.co/bibobovezave/hhGPxr8/broken_heart_pictures_free_download.pdfIn PDF document text
    • https://forugizatufuru.weebly.com/uploads/1/3/1/4/131410167/3385229.pdfIn PDF document text
    • https://cdn.sqhk.co/puranajav/HdgchcB/bloons_td_5_download.pdfIn PDF document text
    • https://cdn.sqhk.co/ziloteduxemo/ihlgjjf/lucky_block_minecraft_pe_1._14.pdfIn PDF document text
    • http://nerroba.info/free_birdhouse_plans2uhjn.pdfIn PDF document text
    • https://bevemobuzaza.weebly.com/uploads/1/3/2/6/132681194/873c699c9.pdfIn PDF document text
    • http://moneyindia.site/xivodorozokuwevyd70.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/vLoapie/calculate_percentage_increase_decrease_excel.pdfIn PDF document text
    • https://cdn.sqhk.co/tedatekalo/jhhd4rf/pinball_games_for_sale_edmonton.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/tujevaxanaju.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/apache_poi_3._17_free.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/88430221758.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/gst_calculation_sheet_format.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/indian_cute_baby_images.pdfIn PDF document text
    • https://s3.amazonaws.com/popisiburewixuj/sofugilemimajasi.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/automotive_repair_manuals_free.pdfIn 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_off0000e755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE755 4936 bytes
SHA-256: 1ac3875d22ef817532100548aba055943c9abef134da115344dd31e44d7bed10
font_01_sfnt_off0000f7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FE 17848 bytes
SHA-256: d84ea818a67a0a681d618c614dee8b379dc26b893a3595cf153978b8b101abe3

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