Malicious PDF — malware analysis report

Static analysis result for SHA-256 90fb0bdf6dec70ba…

MALICIOUS

PDF

69.2 KB Created: 2021-05-07 05:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 795d5b1b6128961a200e517f586708ce SHA-1: 202c1b4f376827b9031dec09e35d2c90cf8ee1b8 SHA-256: 90fb0bdf6dec70ba0c52ec32a1eb251161f8577e979b17f9df1ae87f0f5d33fc
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links to external websites, many of which are flagged as malicious or hosted on disposable domains. The document body, though heavily obfuscated, contains text related to 'Nordic track exp 1000s treadmill', suggesting a lure. The presence of PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics, along with ClamAV detection, strongly indicates malicious intent for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://crophysi.ru/strik?utm_term=nordic+track+exp+1000s+treadmill In PDF document text
    • http://pofuxubilet.sportsontheweb.net/bamobijopi.pdfIn PDF document text
    • http://harmony-market.ru/nokodikutuwerbqf43.pdfIn PDF document text
    • http://esagafow.fun/87573592226kt9nn.pdfIn PDF document text
    • http://rezexepenoma.scienceontheweb.net/20567189192.pdfIn PDF document text
    • http://sesalon.xyz/44355890871gyikg.pdfIn PDF document text
    • http://insta-sale.site/76376963032q0jhu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8458b573-1d6d-478c-912c-b10a972f31df.filesusr.com/ugd/150112_63bac75a07ec4e4aa0f96e8f8595af25.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/41f5a4a9-f832-4083-933b-2a652d110429/3764282173.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/095f4c62-fa12-4f41-a06a-56d1235ab9ce/2015_ap_english_language_and_composition_free-response_questions_question_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eba9f749-9262-442c-aa09-c163983f95f9/julian_calendar_2020_excel.pdfIn PDF document text
    • https://91e55214-10ad-44cf-a10a-60a9392df58b.filesusr.com/ugd/e1c37d_3f292e4665124126ae1698cef25b9cbc.pdf?index=trueIn PDF document text
    • https://d787a32c-196b-4e99-9c98-3ae3c28023f9.filesusr.com/ugd/05b469_fcd3e30c96de4f0694f54d157899742a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/04852982-5ff1-4c3d-805c-073ebb5453ae/dojemewitisafomolo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fa5e5dd-7f6d-4b85-bab1-0621ae51a94f/pukuzijotepegarebo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ac9cf62-2023-4b52-b714-9655a7bab46d/what_is_print_head_alignment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/342e98d0-4e5b-45f6-a321-596f46bc6749/pentair_superflo_vs_error_code_001a.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae4c71c0-37c8-4729-a856-3d4aafdb0892/how_to_charge_polaroid_snap_touch.pdfIn PDF document text
    • https://22520ec4-2132-45a5-98b8-54db1b71d3ea.filesusr.com/ugd/b33b96_838deac1681c47c8bcff5ccd79c90e93.pdf?index=trueIn PDF document text
    • http://tifavamifikas.myartsonline.com/57390442589.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d775297-8edc-4093-a3fe-c7e35b177296/why_is_my_fitbit_versa_lite_screen_black.pdfIn PDF document text
    • http://fuwutowamig.myartsonline.com/subarachnoid_hemorrhage_pathophysiology.pdfIn PDF document text
    • https://a208a2de-cee2-48c2-86e3-c620a022946d.filesusr.com/ugd/dda32d_92f9c0c6b29e41d78cc376cf228b8d63.pdf?index=trueIn PDF document text
    • https://af431a04-9ebc-4ea4-a98d-45e4ffbfad14.filesusr.com/ugd/485053_4b0fb21b1c8540beae1f2fac60465ac7.pdf?index=trueIn 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_off0000d17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17A 5516 bytes
SHA-256: 93df364c1a9c87f194222daa7f5e7a83c140af153645aae499d4be66338e0fab
font_01_sfnt_off0000e432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE432 10280 bytes
SHA-256: d0d5aac49a2cca58d69157d5ae90316cc3d2b96b4cdadaf812920717679bedc8

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