Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b3bd00f1f4a2c39…

MALICIOUS

PDF

80.9 KB Created: 2021-05-22 05:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bda9d0d25df00872d4dcc4ca1b227ca9 SHA-1: 9fd8988c9bdfb3934e9f7f5d2bf56ea1999b3fd5 SHA-256: 9b3bd00f1f4a2c3987a57c755db6e620aadb5baee3901c4630ad2b7ee74942c1
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 0.9998

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 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://baarspo.ru/strik?utm_term=gta+vice+free+download+for+windows+7 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465025/normal_601ddb03da157.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490116/normal_605f247ebb484.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481158/normal_6038c6a99d755.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388815/normal_6056fcedeaf1a.pdfIn PDF document text
    • https://fukaxoxatu.weebly.com/uploads/1/3/1/4/131438517/tuwujijajotogux-kemuvesogu-tagupem-lobifugerok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489264/normal_5fdc6d1ebfbb9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368485/normal_5ffe915a78940.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464056/normal_605df74452c9b.pdfIn PDF document text
    • https://xubejuvanexog.weebly.com/uploads/1/3/5/3/135311054/zuzupapesijaso.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/kewuxejikiwe/korof.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/vuxunozotifisadojezun.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/what_can_i_eat_on_a_no_grain_no_sugar_diet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b47452c1-880f-4a2f-8b41-96774b4826a6/jigowukudi.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/what_are_some_good_smoothie_recipes.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/41109404706.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4ae651c-400f-4478-b537-94fc2351b9ea/detox_diet_plan_for_weight_loss_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/soxam.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/gonuwu.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_off0000f2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B2 5068 bytes
SHA-256: 8fdc4511f50a8789223eefff947581a0f51caf9ea2ce7f3f3dc9f365fdbb38c8
font_01_sfnt_off0001041d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041D 10224 bytes
SHA-256: aae16193080c8b63400df2fda912da847537eb5375f7228f4c4d076664b96f0a
font_02_sfnt_off000126c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C9 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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