Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b6e3012525772e8…

MALICIOUS

PDF

76.0 KB Created: 2021-02-28 05:47:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7b004fa1e31beda58d0433792a5eb411 SHA-1: abe14303692e42484311bc3f649b0abe59804897 SHA-256: 2b6e3012525772e8fba4819d8f13450cd11b167528a4dfeea203077baeb239f3
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm with numerous external URIs pointing to disposable hosting. The presence of 'utm_term' parameters suggests a phishing or tracking intent. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs indicate an attempt to redirect users to potentially harmful sites, likely for credential harvesting or malware delivery.

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://nipisod.ru/strik?utm_term=fashion+graphic+design+jobs+nyc PDF link annotation
    • http://girlita.space/cutting_paper_online_freeje8g4.pdfIn PDF document text
    • http://nefuwumimo.iblogger.org/id_passport_photo_maker_apk.pdfIn PDF document text
    • http://expressvpn.store/d_d_descent_into_avernus_downloadwu1zl.pdfIn PDF document text
    • http://xevusezes.medianewsonline.com/nipisaripavugudokaveb.pdfIn PDF document text
    • https://zimemomikinipex.weebly.com/uploads/1/3/5/3/135347479/reluvaworovok_fexujudotor_ketesagoriwi.pdfIn PDF document text
    • http://gemubanabugawa.mypressonline.com/favemoxobes.pdfIn PDF document text
    • https://wuvalarovujed.weebly.com/uploads/1/3/4/2/134266489/5c24b14014.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
    • http://lipidojomodu.rf.gd/82506448675.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/love_failure_sad_whatsapp_status.pdfIn PDF document text
    • http://gabigirinekib.rf.gd/tosod.pdfIn PDF document text
    • http://pikigefunix.epizy.com/hindu_calendar_2019_thakur_prasad.pdfIn PDF document text
    • http://warufadul.rf.gd/navy_correspondence_manual_spelling_out_numbers.pdfIn PDF document text
    • http://gegokuberil.rf.gd/song_aishiteru_banzai.pdfIn PDF document text
    • http://xujalebarot.epizy.com/83900942546.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/xakugiwaxenoruxug.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_off0000e091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE091 5284 bytes
SHA-256: 8c60048a1f5a45516e0e1140e42e9312ae2125405cd40eb5eb179c2123ce249b
font_01_sfnt_off0000f26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26F 10096 bytes
SHA-256: c39d1b81addd8e62cfe82f05f05055656af7ec4a26918d036cd4681af84e42a7
font_02_sfnt_off000114fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FE 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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