Malicious PDF — malware analysis report

Static analysis result for SHA-256 a733f79a66d7f254…

MALICIOUS

PDF

118.9 KB Created: 2021-02-28 13:05:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a3d2d0639ecf167e22fd6a4591b321e3 SHA-1: d69dc5106da64f624ce9a5cbcae737360fa1c875 SHA-256: a733f79a66d7f25496dcfb50ba1feaf28b3fc1c90ebbce458f40fd4e56683edc
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While 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 6

  • 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 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.
  • 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://golowaki.ru/wix?keyword=pain+destroy+the+village PDF link annotation
    • http://gufutaca3.xyz/21583250273akop4.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/dNA0idJ/84973053778.pdfIn PDF document text
    • https://cdn.sqhk.co/fofateze/ezvZlb8/xejalufexopeketos.pdfIn PDF document text
    • https://sokifaxus.weebly.com/uploads/1/3/4/6/134666683/gakatagaker-fipaluwujumu-duvuwojas-babid.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/iphfzhc/38052332.pdfIn PDF document text
    • https://lajutiruwogow.weebly.com/uploads/1/3/4/5/134585316/novinowukadub-sogaki-wazogo.pdfIn PDF document text
    • https://wozibasibif.weebly.com/uploads/1/3/4/8/134868806/gibasig.pdfIn PDF document text
    • http://clubstore.info/national_lottery_authority_registration_formtf31n.pdfIn PDF document text
    • http://itdiscount.info/fegibexivazof4rbb.pdfIn PDF document text
    • https://garisufusomepis.weebly.com/uploads/1/3/0/7/130740000/1579329.pdfIn PDF document text
    • http://ledimpress.biz/fuzozelab2n6mg.pdfIn PDF document text
    • https://fulesinarube.weebly.com/uploads/1/3/4/7/134729099/muxejikizisuko_zexodadarizilu.pdfIn PDF document text
    • https://debuvubuni.weebly.com/uploads/1/3/4/8/134846467/b6882f5446c55a.pdfIn PDF document text
    • https://kuruxeronujupo.weebly.com/uploads/1/3/4/4/134477992/nadafokig_gufipejekiz_pazedanug.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://zesodowiponuse.epizy.com/samsung_rs265tdrs_xaa_water_filter.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001134e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134E 35320 bytes
SHA-256: b5b1842431704145b4348655f0241e86cb0a1f974ecf7acdbf4c2cc20530a6c7
font_01_sfnt_off0001819a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1819A 5036 bytes
SHA-256: 136ba68cfcc1350ad5e67a7fda401babb34b0c72795d3a7d516d3abb816ab492
font_02_sfnt_off000192b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192B7 14440 bytes
SHA-256: 6a27242084661aceadd76623024ff49273498249cd97d4822981164190df7450
font_03_sfnt_off0001bf99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF99 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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