Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a333ce9734a979d…

MALICIOUS

PDF

72.9 KB Created: 2021-02-19 00:44:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 188a61cc2645fac0f1aaaa910b3011fb SHA-1: 1ad6fb68db8d567791d85131383b54828ee08afd SHA-256: 4a333ce9734a979d1fa2463087a4c651dbe22ea4f5a805024db1ab7ddd46ab5b
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://crophysi.ru/wix?keyword=my+boy+emulator+apkpure PDF link annotation
    • https://kazilapematif.weebly.com/uploads/1/3/5/2/135293457/talej.pdfIn PDF document text
    • http://vivadoctor.ru/what_foods_are_good_for_heartburn_during_pregnancylnwne.pdfIn PDF document text
    • https://lififamofupuge.weebly.com/uploads/1/3/4/3/134317858/tefafesubezezu-buxidajewave.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403937/normal_5fed470bdb88e.pdfIn PDF document text
    • http://smartcreditus.info/christian_meditation_experiencing_the_presence_of_god_by_james_finleysrv37.pdfIn PDF document text
    • https://romuxejis.weebly.com/uploads/1/3/4/8/134887308/2864178.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475725/normal_6000192c52914.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://defasawune.epizy.com/a_level_mathematics.pdfIn PDF document text
    • http://lumaxixi.epizy.com/80143716921.pdfIn PDF document text
    • http://degejukifukux.epizy.com/tubagud.pdfIn PDF document text
    • http://zulexesovo.epizy.com/bosete.pdfIn PDF document text
    • http://lememisuxelivem.rf.gd/68088409284.pdfIn PDF document text
    • http://zoxokukazo.epizy.com/lotus_elise_buyers_guide.pdfIn PDF document text
    • http://jijetebum.epizy.com/jarawivizod.pdfIn PDF document text
    • http://lokuvutifinulef.rf.gd/bursary_form_nyandarua_county.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_off0000e0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EE 5100 bytes
SHA-256: f8799852e3cba6f13244108c0c55df8dcecc5085d17383b47543703956465a1b
font_01_sfnt_off0000f241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF241 10556 bytes
SHA-256: 73dfc62e2476e94b246f9875e066c72c3bd06a08ca5046eddd5d59b31c512fb3

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