Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b444d0d566aaf94…

MALICIOUS

PDF

69.9 KB Created: 2021-03-22 00:45:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 6631c4097f9dd42d50ca0acb78a066e8 SHA-1: 2a6b7371ab8dbf3fba774e2ea9d6749cb649f994 SHA-256: 5b444d0d566aaf94409de5e45ea854b630249199906d23fa3a0d00c954d78e39
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://crophysi.ru/strik?utm_term=how+to+do+exponents+on+a+ti-30x+iis'. This indicates the document's primary purpose is to lure the user to this external site. The ML classifier and ClamAV detection further support the malicious nature of the file, classifying it as phishing or a trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=how+to+do+exponents+on+a+ti-30x+iis In PDF document text
    • http://sopisafexuj.sportsontheweb.net/mexosokupinumus.pdfIn PDF document text
    • http://richmaya.site/zabakaxuvefipugafoxso4bx.pdfIn PDF document text
    • http://allostar.buzz/wazinapedonahj2.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/jozaponi/vifenuforitugexiri.pdfIn PDF document text
    • https://s3.amazonaws.com/runuzitexokol/34606491632.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/mobogenie_android_uptodown.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1650cb57-7b86-4c18-abcb-9b02d9a50205/shark_euro_pro_sewing_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/jojowixovawuv.pdfIn PDF document text
    • http://kopolug.myartsonline.com/jurnal_toksisitas_amfetamin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ada89755-31ee-4efb-ae8b-3572b2735a3e/dell_optiplex_9020_ultra_small_form_factor_business_desktop_computer.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/60626567720.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93fb9299-f921-4cbd-afad-cf25fc0d429d/3411477055.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce1e3a00-6b64-4cb5-974a-0308453ef3bf/2001_honda_accord_transmission_rebuild_kit.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/43749133595.pdfIn PDF document text
    • http://nejesezape.myartsonline.com/devizizigonowagogeje.pdfIn PDF document text
    • https://s3.amazonaws.com/timituvupame/sexomepotaxuguxa.pdfIn PDF document text
    • http://fepetixapokurob.myartsonline.com/picadura_de_abeja_en_nios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f7eda81-76da-4639-9a16-20be13eb0d8f/1st_grade_handwriting_worksheets_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_off0000d2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DF 5284 bytes
SHA-256: 29f03a07ebe9fc44678c91c14ef960e179e3ac348fb4f59457da39cbba5a9ad9
font_01_sfnt_off0000e506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE506 10952 bytes
SHA-256: c125dd38f5089eae926342af8dc39e761232ba968b3b09796f98ca6f22ef38ab

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