Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cc670bc9e5f6b15…

MALICIOUS

PDF

75.6 KB Created: 2020-12-04 03:12:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f1b146e2633bd09d866100faaddee3fd SHA-1: 531ed174b694d6340f4c83a7647af8fbe0593e0c SHA-256: 3cc670bc9e5f6b155cc0aa5454af9c7a030056ae354905a55c75aa3d4bb1e607
156 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 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 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.
  • 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://traffset.ru/wb?keyword=free%20modern%20letterhead%20template%20word PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415292/normal_5f9a1fe7a89e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375199/normal_5fab7b2a71284.pdfIn PDF document text
    • https://gunobodupisar.weebly.com/uploads/1/3/4/6/134677737/ruzokilifutom_lenajiromubewot_mesej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369525/normal_5f984ef35c38f.pdfIn PDF document text
    • https://gisoroweri.weebly.com/uploads/1/3/4/8/134893792/2272893.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457563/normal_5fc60fb7898ab.pdfIn PDF document text
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/789683.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
    • https://s3.amazonaws.com/webipejonavuv/22816617155.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/kellymitchell_group_seattle.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/conjunction_form_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/titugome/leonard_cohen_biography.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/zhiyun_smooth_4_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/637c9c94-5922-4006-ae33-2c5a85a077fe/carlos_castro_arias.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_off0000dffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFD 4808 bytes
SHA-256: b12a02f49f00d0ff970641d7c1a80af1c9e37b9ea5690247aeb66ed35ce39a2a
font_01_sfnt_off0000f02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02D 10464 bytes
SHA-256: b0268b167a52b920e0e9bc1b32888ef9b17ca23f40c94dcf3e4f8c5fed1d38c4
font_02_sfnt_off000113b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B9 4324 bytes
SHA-256: ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c

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