Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ab2a7cb205a0d8…

MALICIOUS

PDF

85.2 KB Created: 2021-04-03 09:25:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 248d9695462e475b72abda87b7ce9548 SHA-1: 962a61eb0a59917bdbdba51ebc5d4dfce8516e36 SHA-256: c9ab2a7cb205a0d8a27e6cd765f0709c0307b4117d155b9d2a932d806ad5da27
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious content, possibly for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/strik?utm_term=how+to+apply+due+date+formula+in+excel
    • http://xosubowavenu.mypressonline.com/likemajosa.pdf
    • http://vegoletox.medianewsonline.com/autobiography_of_a_banyan_tree_in_1500_words.pdf
    • http://goladelexugezi.sportsontheweb.net/30771919276.pdf
    • http://ritefajitexu.scienceontheweb.net/81058908625.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dagewokoxigu.rf.gd/88851046390.pdf
    • https://cd753cf5-d90a-4073-9c55-931a76e81761.filesusr.com/ugd/8826df_dc74db0765ce41e4b4205219228c8848.pdf?index=true
    • https://1fd079ea-3156-4ae8-a0b4-6153e0b529c5.filesusr.com/ugd/e66bf7_c897df3aed8546358f736e055269af6c.pdf?index=true
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_8aa040a1465b4f3888ace2eee3a31d09.pdf?index=true
    • https://44eeb0f0-4dc9-4d8b-b3fd-cc7ace98e90e.filesusr.com/ugd/a083a1_405e4aa2610847eabc793f300e00a7c4.pdf?index=true
    • http://gebilame.epizy.com/34962164890.pdf
    • https://s3.amazonaws.com/gezejoputiwinu/15296555989.pdf
    • https://s3.amazonaws.com/seriposuj/92285073823.pdf
    • https://9610c43f-1b2a-4a8a-b660-75aaf3908198.filesusr.com/ugd/286fb8_d94072c23ad84d6ebcb2d73a7097c2cf.pdf?index=true
    • http://lexamokoxerum.atwebpages.com/aditivos_para_concreto_y_mortero.pdf
    • https://ad0d0dbb-669b-46a9-85df-79487014a0f3.filesusr.com/ugd/00d95d_457a69f00cce45a894d0475677af00e6.pdf?index=true
    • http://fajenadiwizowo.atwebpages.com/bsc_1st_year_chemistry_syllabus_download.pdf
    • https://5a6df620-610b-4d6f-8f1b-71e936bb70bc.filesusr.com/ugd/1f5cef_4f823bfb184147b0abd8c6b2fdf4efcc.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f53.bin
093d27cefbc9f3e150c37d7c211e2c1d5416899056e22df47568539b3e28a320		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F53 5344 bytes
font_01_sfnt_off0001218b.bin
1e67a6d84b0d7cc5986d12b92c789d421a1743745c927859e8cb0535c5564cda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1218B 11052 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.