Malicious PDF — malware analysis report

Static analysis result for SHA-256 853afb95f5ab5072…

MALICIOUS

PDF

73.5 KB Created: 2021-05-18 13:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 5a482572ffd26d8ef6c90209cd7d8ff3 SHA-1: 1dbbc4331e63d93da6d65667173ed6dbac0f92ae SHA-256: 853afb95f5ab507213bbae8a890e5e08b88df3a1ee2b2dc44685a0ff63e53a28
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dugedepap.ru/strik?utm_term=offroad+outlaws+mod+apk+2019 PDF link annotation
    • https://relewamomoj.weebly.com/uploads/1/3/4/3/134349818/a83e89.pdfIn PDF document text
    • https://tiwebusimevadeb.weebly.com/uploads/1/3/5/3/135346158/9803457.pdfIn PDF document text
    • https://guzajemifuraruv.weebly.com/uploads/1/3/0/8/130874286/0013f.pdfIn PDF document text
    • https://kabudededawizo.weebly.com/uploads/1/3/1/3/131383409/bidufinigovi.pdfIn PDF document text
    • https://jefanumu.weebly.com/uploads/1/3/4/8/134889008/dekaxu-kedukajizopi-gesinizet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuzezufomazo.rf.gd/bissell_little_green_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/pativevodelovuladun.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/voxejobumo.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/59882547659.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/classification_of_antibiotics_based_on_spectrum_of_activity.pdfIn PDF document text
    • http://nunetam.epizy.com/85679021445.pdfIn PDF document text
    • http://sabaramofedofi.rf.gd/calendario_lunar_cannabico_2020.pdfIn PDF document text
    • http://wubojupegija.rf.gd/reglas_para_acentuar_palabras_agudas_graves_y_esdrujulas.pdfIn PDF document text
    • http://tozurunoxutasu.epizy.com/78956002431.pdfIn PDF document text
    • http://wazinupizut.epizy.com/free_andy_os_offline_installer.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/7954625886.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxefemebidaz/8730437197.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_off0000ded3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED3 5852 bytes
SHA-256: e5b1b530a5791cfdbf39b8a3cb8ac7309fb2e610bbb2a079fd97bc2a52ee1dd8
font_01_sfnt_off0000f2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C3 11276 bytes
SHA-256: b6fe5e793f30db588f5abef54b34e53fc76ae2b4efb98fbc0bae8c3adbded0c0

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