Malicious PDF — malware analysis report

Static analysis result for SHA-256 06a39923001fb735…

MALICIOUS

PDF

79.5 KB Created: 2021-02-18 12:54:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 8859b5c3b8e45035a23b535410c8729e SHA-1: 478a3f7fced95026a3e7075bf9d0cccd255741ef SHA-256: 06a39923001fb735e32e97e0e09e9f6c1ab213a1cf9e075b480666532cfe67bd
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV also flagged this file as malicious. The document body, though heavily obfuscated, suggests a 'worksheet' lure, which is a common tactic for phishing or distributing further payloads. The presence of multiple links on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/wix?keyword=transcontinental+railroad+worksheet In PDF document text
    • https://cdn.sqhk.co/xibidodoko/jaePgid/wojajegimujen.pdfIn PDF document text
    • http://rizaloripejo.iblogger.org/formule_semi_dveloppe_de_l_ammoniac.pdfIn PDF document text
    • https://nametipij.weebly.com/uploads/1/3/1/1/131164318/2739145.pdfIn PDF document text
    • http://dezlice.ru/around_the_world_in_80_days_2004_full_movie_online_free80o4d.pdfIn PDF document text
    • http://tipografiyav.moscow/87114501054nnwf3.pdfIn PDF document text
    • https://dobetabuzaduguz.weebly.com/uploads/1/3/5/3/135312815/7523064.pdfIn PDF document text
    • http://about-fb-support.com/starbound_novakid_village_coordinates6bp1q.pdfIn PDF document text
    • https://basavorulifa.weebly.com/uploads/1/3/4/8/134899730/15ee8468a2.pdfIn PDF document text
    • https://bowonalixatan.weebly.com/uploads/1/3/5/3/135347428/fabaruxevumisa-samefugaruf-votevos-bavomaguza.pdfIn PDF document text
    • https://cdn.sqhk.co/koluvukirate/bjehcjd/20475776132.pdfIn PDF document text
    • http://xevidome.iblogger.org/manualidades_de_navidad_2017.pdfIn PDF document text
    • http://francobusiness.com/554272815364dxwh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zinudipir/military_phonetic_alphabet_worksheet.pdfIn PDF document text
    • http://gezixerigalejeb.rf.gd/networking_skills_essay.pdfIn PDF document text
    • http://vimobuzu.epizy.com/83804711397.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/bomogazijunudubed.pdfIn PDF document text
    • http://pixoriwabivonol.rf.gd/incautious_crossword_answer.pdfIn PDF document text
    • http://dixadenidufudu.epizy.com/nisob.pdfIn PDF document text
    • http://sogigadataga.epizy.com/lundin_mining_annual_report_2018.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_off0000fc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC13 5132 bytes
SHA-256: ba53d6e4ca776967d0bbf2b6a5f71a41dfa85c3d2cf45c9b6f94061202b4aa71
font_01_sfnt_off00010d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8E 10280 bytes
SHA-256: 4f50b8418eeeb39a3b49f10caa5eb89cea203975655aaf4a31e99d2a7b933a1c

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