Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc126885e7de4068…

MALICIOUS

PDF

70.3 KB Created: 2021-05-22 19:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8500f110b69dad8bb3d2632796bf8f7b SHA-1: 71250ca9e0f175abec937de067e56a14482c78f8 SHA-256: dc126885e7de40681247092a36a3a29dd4f97980d213c036165046b4e6e0094a
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating a malicious redirector link to 'https://crophysi.ru/strik?utm_term=what+is+fetch-execute+cycle+definition'. This URL is likely used to lure the user to a malicious site. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious URL in a PDF is a strong indicator of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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=what+is+fetch-execute+cycle+definition In PDF document text
    • https://cdn-cms.f-static.net/uploads/4469631/normal_60150f19df201.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453754/normal_60500ce893b64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463807/normal_5fd64205957b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445531/normal_606e0fd3cce53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371244/normal_6066a687f02d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491925/normal_5fce58f59521d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382194/normal_5ff829746d4c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421464/normal_601835d3d369b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e9772eae-3099-458b-80c5-59b4fd225075/is_nutribullet_better_than_a_blender.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98f9e256-38ca-48c0-835e-d8be99e26c97/whirlpool_duet_steam_washer_troubleshooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5afdcf74-f936-4e9e-b01a-15385cfb320c/xotimaviva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1eddbe3-b39e-4710-8702-7047df991814/fapoxavomegini.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77145e17-96e2-428e-9080-5a2ed764dacf/potterton_powermax_he_error_code_a01.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/spicejet_boarding_pass_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/796fee19-aeeb-420e-b2c8-12e0f1f3ca19/13092636913.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8abcadfa-38be-4af5-9eb2-2f67c50bd605/why_does_my_kenmore_washer_not_spin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a339cfcb-ccda-42fd-bc78-af904362631c/logitech_mk710_review.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/nothing_else_matters_intro_tab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95706ac5-3f71-4ecf-9bdd-2f8ce921642f/buribijeter.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/86169151415.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bd9bca2-3166-4eb0-a022-63f8a8c7694c/where_do_most_sea_snakes_live.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/love_wedding_couple_wallpaper_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17e29754-4ae1-440a-897e-f27399fff1e7/53304166755.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD3 5108 bytes
SHA-256: 80d937af86f61286fc3a5dfe5e97e2ee5c71230850da243e0544632ea73d01a3
font_01_sfnt_off0000dc42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC42 9760 bytes
SHA-256: 3a6badd6911e09172fe4d897b9d9dad4616154c4b465f4b841a3afae7eb1d60e
font_02_sfnt_off0000fda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA1 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34