Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7f10e4d88895d4d…

MALICIOUS

PDF

69.3 KB Created: 2021-02-25 17:12:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: a50c8dc6a09f62381f890b19fc92f878 SHA-1: d1b88c608121980845f7c868db85f8b8ddfc8a07 SHA-256: f7f10e4d88895d4df94ea0b8172dd84008ecf14bbfd29d4dcbe97efc08f47abe
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary focus on a link that appears to be part of a phishing lure for 'itunes gift card codes'. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The presence of numerous disposable domains and UTM parameters suggests a campaign designed to distribute malicious content or phish for credentials.

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://crophysi.ru/strik?utm_term=how+to+get+itunes+gift+card+codes+for+free PDF link annotation
    • http://wisagomojinux.iblogger.org/67511649804.pdfIn PDF document text
    • http://jinevul.mygamesonline.org/lang_leav_books_list.pdfIn PDF document text
    • http://numulul.mygamesonline.org/74879386766.pdfIn PDF document text
    • http://jojidasusesot.sportsontheweb.net/8974565307.pdfIn PDF document text
    • http://kakafeg.scienceontheweb.net/arabic_alphabet_exercises.pdfIn PDF document text
    • http://teren.fun/liziwozaluxusolelukujhood.pdfIn PDF document text
    • http://djami.ru/cnc_router_table_for_metalwxitc.pdfIn PDF document text
    • http://lorakuze.sportsontheweb.net/rumizinugu.pdfIn PDF document text
    • https://cdn.sqhk.co/zidexamuwela/hiSSihM/faxurabutota.pdfIn PDF document text
    • http://guvinesusavilo.iblogger.org/lexile_and_guided_reading_level_comparison_chart.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/magapeguwabe/77278776174.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/pukuwodovebunar.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/berlin_sans_fb_regular_free.pdfIn PDF document text
    • http://birofasadonu.epizy.com/34741330755.pdfIn PDF document text
    • http://musarozopod.rf.gd/watercolor_landscape_painting.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_off0000d07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07C 5212 bytes
SHA-256: 5a75465d1849d3e81ae1ae1872d26780615284fae9ae8afa90cb2b839a3153bc
font_01_sfnt_off0000e260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE260 11128 bytes
SHA-256: 393ceac022ef86fb712e4e026eb81a60804bc5d9332b3ba4f2f1f24e1b324e7a

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