Malicious PDF — malware analysis report

Static analysis result for SHA-256 32d1890e1e13ed01…

MALICIOUS

PDF

77.5 KB Created: 2021-02-13 05:32:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6302d241764ed8d8deb6b172d8cc6895 SHA-1: e4641e197e63507bee1a820541177822ab0be8ae SHA-256: 32d1890e1e13ed010403b8e2badcbd4f628b282bc875ca88b06e35cbda245396
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded links, identified as a link farm, with at least one URL pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or SEO abuse. The document body contains garbled text, suggesting it's not intended for direct user consumption but rather to host the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://yafferge.ru/wix?keyword=what+numbers+are+divisible+by+924
    • http://ferejupaxebul.iblogger.org/android_kotlin_recyclerview_databinding.pdf
    • https://kuvolobogon.weebly.com/uploads/1/3/4/0/134012650/gemaka.pdf
    • https://xisuludibu.weebly.com/uploads/1/3/5/3/135300694/4472517.pdf
    • https://petominezejoza.weebly.com/uploads/1/3/2/3/132303337/8226179.pdf
    • https://jizoneva.weebly.com/uploads/1/3/0/7/130738725/nixalubef-begowol-doxokogotibawe-mibawonadenin.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://gidazajizi.rf.gd/60298965558.pdf
    • https://s3.amazonaws.com/mexavofezoxi/kosujijuraxaloxulipugaxe.pdf
    • http://mevedokepovi.epizy.com/89786313083.pdf
    • https://s3.amazonaws.com/kijelopazekune/creation_of_god_in_7_days_worksheet.pdf
    • http://lojizaruxaz.rf.gd/5946842840.pdf
    • http://gezewezelatemak.epizy.com/catalogo_truper_2017_descargar_gratis.pdf
    • https://s3.amazonaws.com/lonozote/dujavewidiz.pdf
    • http://weguxoxuwaxa.epizy.com/checker_plate_sheets_cheap.pdf
    • https://s3.amazonaws.com/borokegujuzero/pakesevesanivisotidaxu.pdf
    • https://s3.amazonaws.com/dadupawo/android_outlook_calendar_notifications_every_minute.pdf
    • https://s3.amazonaws.com/palikuvexake/4624516861.pdf
    • http://suredutika.rf.gd/python_tutorial_point_for_beginners.pdf
    • http://zuwarikufaz.epizy.com/kudatobazizi.pdf
    • https://s3.amazonaws.com/wapabefizosumi/microsoft_calendar_templates_2020.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_off0000df5e.bin
a2c722d1c050e5049d512230286b6b7990626dc3ad862f47267e511ecdd5f43c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5E 5528 bytes
font_01_sfnt_off0000f1ff.bin
1353b5171a7699d2aefcaa39b5cfde20e60a111da36f26fc8b92fdd06598c449		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FF 12220 bytes
font_02_sfnt_off00011a96.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A96 4324 bytes

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