Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f02c4a28798f019…

MALICIOUS

PDF

84.9 KB Created: 2021-09-18 02:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5e38ad821c35d5796e4e8732fcc0846e SHA-1: b777b3dae6266852816bb85ae70e0e203351a15e SHA-256: 1f02c4a28798f0199884d8416bb89053fe416c3a9237911b02ca02ae61b39677
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=the+taking+of+pelham+one+two+three+1998 PDF link annotation
    • https://chineseclothingonline.com/File/semanewesoxukizi.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/zozojadunorof.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/nakoloboxidegurepujeridok.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/39474571291.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/81214418349.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/15910633984.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/34885014961.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/mazoguberobud.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/fibefepiliniladu.pdfIn PDF document text
    • https://ksuskalology.com/images/file/miwakumewog.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/kutefagemi.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613329ac0ff50---51427018709.pdfIn PDF document text
    • http://fkhd.cz/data/img/levovulu.pdfIn PDF document text
    • http://ailizia.com/userfiles/19683266649.pdfIn PDF document text
    • https://phukienbep.net/media/files/vasezofeperevidudof.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/saxapefazunatenuzemewotow.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/junimexajezexivel.pdfIn PDF document text
    • https://thehouseproduction.net/file/90942114171.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/molisiwijovisi.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/jifufumemipuziwexaker.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/rafoxumo.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/fijivamezoxudafotonexep.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/fixaleziramomewu.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/tibofi.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44E 11204 bytes
SHA-256: 413b97733d6fa4b0fcf1718531d694c4d0296d36b2d4489085642e088c84e6f5
font_01_sfnt_off0000fe75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE75 18396 bytes
SHA-256: 600b6dbec1dd1111969b653a9322a997ef029fdfced1949099bec44bdf0fcc3e
font_02_sfnt_off00012e3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1