Malicious PDF — malware analysis report

Static analysis result for SHA-256 a84b8368174b3ee9…

MALICIOUS

PDF

75.6 KB Created: 2021-03-19 22:25:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 55ccbfe34080c5c176a656157a92684f SHA-1: b5745d8724c1053b4fce660fe9d8db109d2c3da0 SHA-256: a84b8368174b3ee927bc8689814b3c214192f93ab0c7bfdc2c4aa4b505a00520
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful 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://leonvi.ru/strik?utm_term=how+to+find+surface+area+for+a+triangular+prism PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371005/normal_6032e025ab027.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479710/normal_6019201649da4.pdfIn PDF document text
    • http://sopisafexuj.sportsontheweb.net/56849806600.pdfIn PDF document text
    • https://lesapexif.weebly.com/uploads/1/3/1/6/131637780/bevirosix_zedunibital_xofotaligizolif_tifowamowu.pdfIn PDF document text
    • https://lejufonibo.weebly.com/uploads/1/3/4/4/134470114/wajesoji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378605/normal_5fe04ced3c80a.pdfIn PDF document text
    • https://cdn.sqhk.co/ludibipimilu/R2jahgQ/audible_to_pc.pdfIn PDF document text
    • https://nililekekikare.weebly.com/uploads/1/3/0/7/130739967/lamowudum_zefelabipuwu_fizaromebokulaz_gufubajovif.pdfIn PDF document text
    • https://cdn.sqhk.co/rotonoba/hbic8id/billie_eilish_lockscreen_iphone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461751/normal_60390634908f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401691/normal_6011352734d9d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496165/normal_5ff2cd835bb2a.pdfIn PDF document text
    • http://figuxovutofid.mygamesonline.org/introduction_to_management_science_by_bernard_w._taylor_iii_pearson_13th_edition.pdfIn PDF document text
    • http://wedipum.mygamesonline.org/can_you_lease_a_bobcat.pdfIn PDF document text
    • https://xafijedalab.weebly.com/uploads/1/3/0/7/130775792/7ad881f1.pdfIn PDF document text
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/fopelowesulom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4529087/normal_5fc945daea14c.pdfIn PDF document text
    • https://cdn.sqhk.co/fugolamudara/ifwiee2/45567838766.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422163/normal_604aec5187820.pdfIn PDF document text
    • https://cdn.sqhk.co/tixukiko/geDgcNm/pujenobowutukawubuxad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fozozip.onlinewebshop.net/public_relations_books_download.pdfIn PDF document text
    • http://wiwosotu.myartsonline.com/cesare_lombroso_o_homem_delinquente.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_off0000e700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE700 5528 bytes
SHA-256: 9776d1c96e8ee084d18070cbc6f17f0f6346718d4eeec75c2b0fbcb388a7d802
font_01_sfnt_off0000f9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D4 11560 bytes
SHA-256: 9c548a0cf60a8d908350bf777799dcac7eb70517a8424343c294a3b6db53456f

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