Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad5d65040303e4af…

MALICIOUS

PDF

77.6 KB Created: 2021-02-11 06:55:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a1075e48388776fcdd780cd1c215edaf SHA-1: 2a281b2d8ce7c71c64f2a0b584f2e343cbebe1dd SHA-256: ad5d65040303e4af0244ce024d110a1c5c3d4e16ffc3533b274fa6c44d05daf4
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting services, and is flagged by heuristics as a link farm designed for SEO manipulation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/aws?utm_term=brilliant+pala+screening+test+sample+papers PDF link annotation
    • https://rojanebe.weebly.com/uploads/1/3/1/6/131637229/9400690.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426557/normal_5fef54a0de71a.pdfIn PDF document text
    • https://wuxelulomevadi.weebly.com/uploads/1/3/4/9/134904547/6984606.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407331/normal_600930faf1583.pdfIn PDF document text
    • https://vakilonote.weebly.com/uploads/1/3/1/3/131382032/3161147.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377115/normal_6010a393be1af.pdfIn PDF document text
    • https://mogobuzuxoxede.weebly.com/uploads/1/3/0/7/130740257/sijib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413226/normal_5fdc5c04bb480.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490263/normal_6004c16d6399a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389581/normal_6024a5469b0a8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471081/normal_5ff68626893a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485436/normal_5fdc6c2d2250b.pdfIn PDF document text
    • https://ripukalogud.weebly.com/uploads/1/3/4/3/134391837/banev-moboburib.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://juxudawalugevop.epizy.com/54845482203.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/blank_clock_face_worksheets_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/22509727586.pdfIn PDF document text
    • http://kajifota.epizy.com/68379636505.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/captain_america_endgame_wallpaper_hd.pdfIn PDF document text
    • http://kobizesamow.rf.gd/jupezudok.pdfIn PDF document text
    • http://fazafowunop.epizy.com/kepoxejoker.pdfIn PDF document text
    • http://xafegewoweli.epizy.com/30173553945.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_off0000e459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE459 4980 bytes
SHA-256: 2491156b09ec96f9d413695e368a58f6fc8acd2d6bb8d582677e73b1cd8459f6
font_01_sfnt_off0000f51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51D 11068 bytes
SHA-256: f500a4bc224abf0db776491484eabec11206e8e07d460337f1bdca2c5c4319ac
font_02_sfnt_off00011af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF8 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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