Malicious PDF — malware analysis report

Static analysis result for SHA-256 8222724f3333aafe…

MALICIOUS

PDF

67.1 KB Created: 2021-04-09 04:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d9728e1468a90afc648c276f66aa7678 SHA-1: 2c21a3cad7c830e587bfb823b45522306b726d10 SHA-256: 8222724f3333aafecb3de4084c5b2a5d816a4d91c682e53dfd70e39f03a4fe0c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://midufefew.ru/strik?utm_term=fender+super+champ+x2+tube+amp PDF link annotation
    • https://cdn.sqhk.co/repudodo/Ejfhcih/52146443829.pdfIn PDF document text
    • http://ttop-shop.com/152945530340d2lo.pdfIn PDF document text
    • http://natorg.fun/what_kind_of_stickers_can_you_use_in_resin1jjau.pdfIn PDF document text
    • https://cdn.sqhk.co/faxiwapa/bNavghy/word_blocksatz_bei_zeilenumbruch.pdfIn PDF document text
    • https://tivagirususu.weebly.com/uploads/1/3/5/3/135350390/6302603.pdfIn PDF document text
    • http://springwin.space/29139237184ipzce.pdfIn PDF document text
    • http://curvepreloved.com/puvujikedukidefufeli8p7gl.pdfIn PDF document text
    • https://wixuzezokanozav.weebly.com/uploads/1/3/4/6/134663812/720990.pdfIn PDF document text
    • https://vakilonote.weebly.com/uploads/1/3/1/3/131382032/1936037.pdfIn PDF document text
    • https://kimuremosov.weebly.com/uploads/1/3/4/7/134732255/4800274.pdfIn PDF document text
    • https://muxupodijem.weebly.com/uploads/1/3/4/8/134885552/1247315.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4067fc58-08e7-4891-8dd9-1e130f20364d/zobetukizinufowogubit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73169e57-08d5-437f-adb2-ac689ba5ea9c/how_to_exit_descaling_mode_nespresso_lattissima_touch.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/what_does_the_word_human_condition_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5069f866-06e8-47b9-951f-9ad112eccaec/demepariwomurenebusaxawav.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/11478286799.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/brother_mfc_240c_driver_windows_10.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_off0000c7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E1 5576 bytes
SHA-256: 97bb3703676463ac3fc9450199b80cc7958ce5fb327334de6e8f50c4056f1b31
font_01_sfnt_off0000daaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAF 10672 bytes
SHA-256: b96f4bec1aa74ccf7a3c51e6ac2c6c79a83743b9e643462674ef4951f47b1388

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