Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d3bfb08339d1e7…

MALICIOUS

PDF

82.8 KB Created: 2021-04-06 11:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e64e02fd87d2287ffa9daa1d18148cb5 SHA-1: b173df234b70f05757e13cc8019c90e32316a130 SHA-256: 87d3bfb08339d1e7c55171146af71fdb5cb998f11a4837e8af6fdac6fdad05f0
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://zajinet.ru/award?keyword=comfortably+numb+solo+tab+pdf PDF link annotation
    • https://cdn.sqhk.co/jowepotoxum/ghcicic/herpes_simplex_2_test_results_5.pdfIn PDF document text
    • https://cdn.sqhk.co/tumozaraf/ABiiW0B/60047435413.pdfIn PDF document text
    • https://cdn.sqhk.co/wagomito/ogXhjhj/.pdfIn PDF document text
    • https://fujovufizopi.weebly.com/uploads/1/3/2/7/132710671/liboroma-toveloxofuxiwor-sakiw.pdfIn PDF document text
    • https://cdn.sqhk.co/tumowara/heNYYja/xafoveb.pdfIn PDF document text
    • https://nobarolibefo.weebly.com/uploads/1/3/1/4/131407117/e46477930bc.pdfIn PDF document text
    • https://cdn.sqhk.co/jenojigise/ajggfC9/cabify_app_store.pdfIn PDF document text
    • https://cdn.sqhk.co/gevagedubop/awvopvA/kugupepiwodagaguvomifove.pdfIn PDF document text
    • https://cdn.sqhk.co/zisubiziwu/gVczjdX/pukifudipaxapidotovewerib.pdfIn PDF document text
    • https://cdn.sqhk.co/kewebogi/AenRiaw/15448619985.pdfIn PDF document text
    • https://cdn.sqhk.co/wepurodapike/fGSSoSB/38776977898.pdfIn PDF document text
    • https://cdn.sqhk.co/gojaxaxiwa/eHhejgS/como_conseguir_diamantes_gratis_en_free_fire_real.pdfIn PDF document text
    • https://cdn.sqhk.co/fatobaliv/gghdgyr/cool_american_boy_names_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/nigulavax/xgdWhjq/the_maxwell_nyc_gym.pdfIn PDF document text
    • https://cdn.sqhk.co/loxepafigav/jeifajg/94921786691.pdfIn PDF document text
    • https://cdn.sqhk.co/zaxuloxedu/OjcjcQ3/57825493333.pdfIn PDF document text
    • https://zusabave.weebly.com/uploads/1/3/1/4/131406295/1cb66d597.pdfIn PDF document text
    • https://cdn.sqhk.co/bozawenibiwa/bjfghaK/79462530643.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/lorifawuvawot/64028723494.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/covered_california_medi_cal_income_guidelines.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_off000102b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B4 5332 bytes
SHA-256: afdf1e7a7dca0683f3a035baef930f774e81ad8892c2c2747a181a881b3bc68a
font_01_sfnt_off000114bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BC 12668 bytes
SHA-256: f2ba5862061769659b966d026eaaf3c1ad4f90194a022b775a7c097636fb743a

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