Malicious PDF — malware analysis report

Static analysis result for SHA-256 325cabe0f5790167…

MALICIOUS

PDF

76.7 KB Created: 2021-03-05 06:15:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8af15341aa647712c3c7f2f5e81e8d2b SHA-1: d68b33e9ff4bf2d3eaaccff4d5c1dfdba76db5e2 SHA-256: 325cabe0f579016783fe9e7b39237aa772719fb0f57d094d9900ae07bed1bb0e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, with one prominent URL being `https://dafemum.ru/strik?utm_term=ap+style+dates+month+and+day`. The heuristic `PDF_SEO_DISPOSABLE_LINK_FARM` indicates the PDF is designed as a link farm on disposable hosting, further supporting a phishing or malware distribution intent. No scripts were extracted, but the overall structure and URL patterns suggest it's a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://dafemum.ru/strik?utm_term=ap+style+dates+month+and+day PDF link annotation
    • http://mavigawika.scienceontheweb.net/53811724462.pdfIn PDF document text
    • https://volorizog.weebly.com/uploads/1/3/1/0/131070051/4586498.pdfIn PDF document text
    • http://dakejexisumupok.iblogger.org/jobezebuzulor.pdfIn PDF document text
    • http://bestsaleshopin.xyz/49028598198dwxki.pdfIn PDF document text
    • http://euroshopme.site/zuzanofudojenupizakuji4hzxl.pdfIn PDF document text
    • https://tipozuroboga.weebly.com/uploads/1/3/4/2/134265922/6217166.pdfIn PDF document text
    • http://kevefuwot.iblogger.org/gomareb.pdfIn PDF document text
    • http://banepudota.iblogger.org/alteraciones_de_la_memoria.pdfIn PDF document text
    • http://bopodimo.iblogger.org/hidden_truth_-_forbidden_knowledge_it_is_time_for_you_to_know_steven_m._greer.pdfIn PDF document text
    • https://nabaduvikarupad.weebly.com/uploads/1/3/4/0/134096068/wasojudojo.pdfIn PDF document text
    • http://pc-remont.website/68307998987gzwu8.pdfIn PDF document text
    • http://richteam.site/ignou_mca_solved_assignment_2019-_20_freewubrw.pdfIn PDF document text
    • http://sufinamek.iblogger.org/gis_software_free_windows_7.pdfIn PDF document text
    • http://stroiline74.ru/tracfone_lg_journeydtlpz.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://fovawipemezipu.myartsonline.com/53213037553.pdfIn PDF document text
    • http://nokemufebevezo.rf.gd/89375555256.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/video_di_instagram_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/cash_flow_statement_chapter_12.pdfIn PDF document text
    • http://wigogejuj.epizy.com/amazon_alexa_instruction_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/zipekapewejowitigeniko.pdfIn PDF document text
    • http://nonidimujosapa.epizy.com/bombay_dyeing_bedsheets_in_flipkart.pdfIn PDF document text
    • http://kunasajijujaf.rf.gd/xuwek.pdfIn PDF document text
    • http://koradanizepagow.myartsonline.com/how_to_write_a_self_annual_performance_review.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_off0000e161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE161 4932 bytes
SHA-256: b2482aa79c9c3015a1e77cd8f3f0e67fb3ddf430fbd8bbc7ef8b5608d7c8ab85
font_01_sfnt_off0000f1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FC 10916 bytes
SHA-256: 6f4493243a443f37c8ceff6c575ed09ee70d00876ad37c4043b82efeffef7de4
font_02_sfnt_off00011740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11740 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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