Malicious PDF — malware analysis report

Static analysis result for SHA-256 462f3372a0ea6eb2…

MALICIOUS

PDF

81.7 KB Created: 2021-03-22 14:05:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e0ef14b4f9723b8e3f7b13eeae30847d SHA-1: b1695fb205d0e5895fd008ceb977c21c97c0f100 SHA-256: 462f3372a0ea6eb2f8d21bad2c418ac4969bffcec5bede3a5e8d000705dfdb05
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9997

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
  • 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.
  • 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://dafemum.ru/123?utm_term=ni+action+strings+free PDF link annotation
    • https://cdn.sqhk.co/gasalikuviz/rigBlie/informal_crowd_meaning_in_tamil.pdfIn PDF document text
    • https://cdn.sqhk.co/xekixuzurim/chcjejc/transport_tycoon_deluxe_download_dos.pdfIn PDF document text
    • https://terigemi.weebly.com/uploads/1/3/1/8/131856376/8586620.pdfIn PDF document text
    • https://cdn.sqhk.co/jovojatubo/he3hbUJ/live_traffic_report_merseyside.pdfIn PDF document text
    • https://cdn.sqhk.co/libarazituw/oXAggiF/jebaturusufikigujixe.pdfIn PDF document text
    • https://cdn.sqhk.co/nimabugokofa/hfphhhi/castaway_cay_5k.pdfIn PDF document text
    • https://vomefamatufovo.weebly.com/uploads/1/3/4/3/134378522/2800f.pdfIn PDF document text
    • https://durabaseduxoj.weebly.com/uploads/1/3/4/2/134235759/podagisajulipaji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gugitetororu.rf.gd/9922082889.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/27979931058.pdfIn PDF document text
    • http://palalujopaxuv.epizy.com/15294506383.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/64870116088.pdfIn PDF document text
    • http://defozuwonig.rf.gd/irregular_verbs_definition_french.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/jemepunovosomukafig.pdfIn PDF document text
    • https://s3.amazonaws.com/dazawojob/ayub_bachchu_photo.pdfIn PDF document text
    • http://getakufo.epizy.com/aja_ki_pro_go_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/735add86-4efc-4113-a873-ca826bd06fb8/34872401120.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/hoovey_parents_guide.pdfIn PDF document text
    • http://wufajin.rf.gd/filezilla_32_bit_for_xp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5eed8b97-a1f1-4eb6-bef2-df223af536f4/html_learn_website_in_hindi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62D 4776 bytes
SHA-256: 0ec8f27a55d9629bc6660d513b86a487fe87beaf596d54bc0be2fd159525c7d2
font_01_sfnt_off0001066e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066E 10456 bytes
SHA-256: a3da8b1d864a97a2f72697f1c977e48955742770cde79b46d09600e47838a513
font_02_sfnt_off00012a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4B 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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