Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f376353d8a84a7…

MALICIOUS

PDF

78.0 KB Created: 2021-03-12 07:42:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: aeebc0bad58211ea0c80c9ea62162d97 SHA-1: b732af689b92e7b4c8679529ad1f999439ea685d SHA-256: f9f376353d8a84a76f50c7fe632bfddff6cf3f103119cb4bf1cc9dda5210751f
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating it is likely a phishing or spam document. It contains a large number of embedded URLs pointing to various domains, some of which are known malicious redirectors or hosted on disposable infrastructure. The document body, though heavily obfuscated, contains text related to merging PDF files and the authoring application, suggesting a lure to trick users into clicking links for a purported utility.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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.
  • 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.
  • 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/award?keyword=pdf+bestanden+samenvoegen In PDF document text
    • http://bettermoneytips.com/musculoskeletal_examination_vivek_pandey0rkhm.pdfIn PDF document text
    • http://businessoutsourcing.org/kezukutozokoia055.pdfIn PDF document text
    • http://futup.ru/vefirikazixupib462g.pdfIn PDF document text
    • http://idealica-ordina.site/240201656348artu.pdfIn PDF document text
    • http://vobigabifinu.22web.org/glossary_of_finance.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/YMCjcig/1828144595.pdfIn PDF document text
    • http://noksipals.online/badland_3500_winch_installation_instructions7xhlr.pdfIn PDF document text
    • http://tricitysikhs.com/88616501650kval1.pdfIn PDF document text
    • https://suranekiwexem.weebly.com/uploads/1/3/4/6/134698667/c37b4e0dbabe.pdfIn PDF document text
    • https://safasisi.weebly.com/uploads/1/3/4/4/134472516/zotigekifo-luramumawo.pdfIn PDF document text
    • https://nulebuset.weebly.com/uploads/1/3/1/4/131411431/9270280.pdfIn PDF document text
    • http://timelessdecorum.com/dogukikex68t04.pdfIn PDF document text
    • http://moneyindia.site/sunsun_hw_3028479m.pdfIn PDF document text
    • http://povujusuwaveva.iblogger.org/mepuborivivevifusenefese.pdfIn PDF document text
    • https://nidukonijeso.weebly.com/uploads/1/3/1/3/131381088/gezososage.pdfIn PDF document text
    • https://cdn.sqhk.co/fofotixoz/7mxfsM7/94723484266.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jiwuwusa.epizy.com/optometry_australia_diabetic_retinopathy_guidelines.pdfIn PDF document text
    • http://gikifipililiza.epizy.com/what_is_the_meaning_of_christmas_in_christian.pdfIn PDF document text
    • https://d4f1f58f-bd44-402a-a4b0-a3aa01e36dbf.filesusr.com/ugd/dffefa_a3d06e0a5b97433aa3a27045740e4cfa.pdf?index=trueIn PDF document text
    • https://55f5e71c-5f54-469f-9449-301c43944234.filesusr.com/ugd/bbdb65_9fcf0b65e88a423d8c9a512eac67a62d.pdf?index=trueIn PDF document text
    • http://kirojera.rf.gd/pezudofejujidazuta.pdfIn PDF document text
    • https://c4bedd8b-a3e9-4aa8-9751-a6fde4035b7e.filesusr.com/ugd/037f08_8ce8f9503ff24721bf9442ef28d93a3b.pdf?index=trueIn PDF document text
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_524fdc5609a04f77bacd21e7954f0e77.pdf?index=trueIn PDF document text
    • https://fbaba6ab-37cf-477f-82bd-e10a416eccda.filesusr.com/ugd/3c8574_fad9fee40b6145dc85802bc66401f3fa.pdf?index=trueIn 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_off0000f1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CA 5300 bytes
SHA-256: b1616d3c38b0145cb79b62007edc075e172a027babb73e87d67376dbf2affb50
font_01_sfnt_off000103cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CF 11388 bytes
SHA-256: a6fd3385674baa1303d302306f156d3998f0fd11287eba7381ddcb4ac0876742

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