Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d74f3938520b6ee…

MALICIOUS

PDF

79.7 KB Created: 2021-03-12 18:40:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: bb5e89eae28aa94550b68459faf8c695 SHA-1: ca3eac2f8d71bb06332196b3580060b56081cd9c SHA-256: 4d74f3938520b6ee2e28e84df46f89963c61068f8b08d8931b8cb656254a9988
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/123?utm_term=degradacion+del+suelo+por+agricultura+pdf'. This, combined with ClamAV detection and ML classification, strongly indicates malicious intent. The document body is heavily obfuscated, but the presence of embedded URLs suggests an attempt to lure the user to a malicious site. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=degradacion+del+suelo+por+agricultura+pdf In PDF document text
    • http://irisca.online/84588509507zv27m.pdfIn PDF document text
    • https://cdn.sqhk.co/nejijilo/iabzjdQ/83661731266.pdfIn PDF document text
    • http://ompala.store/tixosabubudaborejuvewuba4pld8.pdfIn PDF document text
    • http://detonic-ro.website/77556093923lh9to.pdfIn PDF document text
    • https://cdn.sqhk.co/bojodunaluko/bidWgiJ/herpes_simplex_ophthalmicus_icd_10.pdfIn PDF document text
    • http://nubolutlion.xyz/antigua_novena_para_posadas_completa7fos2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420037/normal_5fcebd5103280.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446026/normal_6013dbc5cbfa9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409813/normal_6010e2a4b5d5a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374847/normal_5feb7e040c23c.pdfIn PDF document text
    • http://fakaripeti.xyz/ielts_formal_letter_examplep3oix.pdfIn PDF document text
    • https://cdn.sqhk.co/papazokixe/jhiiISw/blue_tailed_damselfly_female_forms.pdfIn PDF document text
    • https://cdn.sqhk.co/dijabidasu/hcShahh/racing_motorcycles_for_sale.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/e42e7eaf-3ed0-4e8b-a7ff-ae0cbaf3a497/cuanto_es_un_metro_cuadrado_en_milimetros.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/zonoforisezubuguxaz.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/candy_blast_game_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wutisigila/10073257386.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/12115103218.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/63915630018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0c4209b-2a0c-4b62-a8d1-3c3e6ae6450b/ft-857_lcd_repair.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/canadian_citizenship_by_descent_application_form.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_off0000f5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CF 5320 bytes
SHA-256: a01ed7b874352a538941d2f48bb4b5d2ffef2d443271f4f33ff357b35a548639
font_01_sfnt_off000107fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FE 12664 bytes
SHA-256: 5ceb66beb6f8da3a3108bf7faffe969259115280ebac27387cd9500e4922db49

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