Malicious PDF — malware analysis report

Static analysis result for SHA-256 758c4f8bd1c94f84…

MALICIOUS

PDF

79.0 KB Created: 2021-06-11 22:38:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bb27029bd8254d2477a40eacf5e4675 SHA-1: d7baa71eb914e5fe1c24c71fefb5de89c08112cd SHA-256: 758c4f8bd1c94f841ebed3a92f976ef7f3fb546c1a94fffb64cffd769ff59c7f
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The presence of embedded URLs and the overall structure strongly indicate an attempt to direct users to potentially harmful external content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://cructi.ru/pbw?utm_term=dishonored+2+overseer+office+safe
    • https://datezovog.weebly.com/uploads/1/3/0/7/130776229/vuwaripolitazu.pdf
    • https://nabiwadi.weebly.com/uploads/1/3/5/2/135298838/7865403.pdf
    • https://betedodokadez.weebly.com/uploads/1/3/4/8/134882186/83bc9e.pdf
    • https://nisozamiroxub.weebly.com/uploads/1/3/0/9/130969329/potiwalo_xexabu_liwalakujajo_zisibudel.pdf
    • https://vorusasu.weebly.com/uploads/1/3/2/7/132740845/6729371.pdf
    • https://letitunonagafi.weebly.com/uploads/1/3/4/4/134494227/53862.pdf
    • https://gadudomarun.weebly.com/uploads/1/3/4/7/134705140/tisutirobajurus_xuwemor.pdf
    • https://gupiwisida.weebly.com/uploads/1/3/4/7/134716232/5932243.pdf
    • https://tuloforukidape.weebly.com/uploads/1/3/4/7/134752744/705764.pdf
    • https://wepugimi.weebly.com/uploads/1/3/1/0/131070973/dudan-podirik.pdf
    • https://zirovosenes.weebly.com/uploads/1/3/4/3/134316706/9452894.pdf
    • https://dibonividuz.weebly.com/uploads/1/3/4/8/134885927/nenila_vavebobo_didobixoxabudef_gedepo.pdf
    • https://fojevuresuzuj.weebly.com/uploads/1/3/4/8/134881640/5135736.pdf
    • https://rabinuzigiv.weebly.com/uploads/1/3/4/7/134737829/1a7c31e3b2d2f95.pdf
    • https://vuzaruluweketex.weebly.com/uploads/1/3/4/4/134478477/xitodu_jafejabixaxid_fesokidosumusu.pdf
    • https://getaforufuzok.weebly.com/uploads/1/3/4/7/134733873/157a1c142fac.pdf
    • https://getedizexagan.weebly.com/uploads/1/3/0/7/130740146/dizasarujozaf.pdf
    • https://mulanazujejuxu.weebly.com/uploads/1/3/4/8/134855463/derojiworedudola.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://pafunanukexe.pbworks.com/f/defining_and_non_defining_relative_clauses_exercises.pdf
    • http://sazupamufode.pbworks.com/f/25651972266.pdf
    • https://uploads.strikinglycdn.com/files/cd766cc1-c88e-4451-b477-6f9dae0ea460/mean_median_mode_worksheet_130a_answer_key.pdf
    • https://uploads.strikinglycdn.com/files/45fc18a9-d658-450e-90f4-62707b7138dd/magic_chef_2.6_cu.ft._compact_dryer_manual.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed5d.bin
2205d53eab1358cf3a52ec37cb62dc890caad93091f75808e6a4b9ff4b6c5d66
pdf-font-stream PDF embedded font (sfnt) at offset 0xED5D 4976 bytes
font_01_sfnt_off0000fe35.bin
52a6887f9216d54fb424bfb8ec16b1737d5219d0a40309e9d9ea6816c25a8b70
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE35 10048 bytes
font_02_sfnt_off0001208f.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1208F 4324 bytes