Malicious PDF — malware analysis report

Static analysis result for SHA-256 be6728a669cf4ab2…

MALICIOUS

PDF

74.2 KB Created: 2021-03-25 19:40:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 32f6d8c3bf9e8ba3ec70efe597af96e9 SHA-1: 5ef0d926d628d48030746addc0f0393d331eabf1 SHA-256: be6728a669cf4ab2abc981c8f9c983ddca209afc2b00ea420f212c4a7e0abba4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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/123?utm_term=streptococcus+agalactiae+en+orina+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383791/normal_601dbb06265b4.pdfIn PDF document text
    • http://goromeo.club/how_to_use_accu-chek_multiclix_lancet_device5wk7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465538/normal_604fa1ede14b3.pdfIn PDF document text
    • https://cdn.sqhk.co/vanewano/MPibieF/lifazilakegadusor.pdfIn PDF document text
    • http://chelobaka.space/233017671487p63h.pdfIn PDF document text
    • http://gogotmif.space/45200164035rzy0k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460447/normal_603872c05a02d.pdfIn PDF document text
    • http://vifezitenof.getenjoyment.net/why_my_phone_will_not_charge.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393028/normal_600baf090ee4c.pdfIn PDF document text
    • https://cdn.sqhk.co/nevawanipo/RUD64Bx/last_valiant_code.pdfIn PDF document text
    • http://sevezor.scienceontheweb.net/pakozudefukara.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418167/normal_60555d391dc18.pdfIn PDF document text
    • http://paxezimusosesa.scienceontheweb.net/nfpa_1410_drills_list.pdfIn PDF document text
    • https://cdn.sqhk.co/tinupolureg/dghUgdE/xawanigugu.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/fogibi/31566788894.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/when_did_schools_shut_down_for_covid-19.pdfIn PDF document text
    • http://jowawaba.atwebpages.com/the_new_media_monopoly.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/sports_car_pictures_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/maplestory_fast_leveling_guide_2018.pdfIn PDF document text
    • https://medlineplus.gov/lab-tests/strep-b-test/In 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_off0000e2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FD 5424 bytes
SHA-256: 57fa28927231646f768dbb63b48c34f33f202833b20fa018a105e1b92b1e4a5a
font_01_sfnt_off0000f57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57B 11732 bytes
SHA-256: 7c441e1e38f62ac647474634f34888f4d8ee2bc25409ec11c54ed10340347f89

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