Malicious PDF — malware analysis report

Static analysis result for SHA-256 3552d9a90ed926f8…

MALICIOUS

PDF

97.4 KB Created: 2021-03-31 05:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 77617de4b80f04a798014dd9e4f4329b SHA-1: 631f5ecee31bfde3d81b13440ad256b7eb8ef642 SHA-256: 3552d9a90ed926f8a41826a286d74a970e68210ff07e49c97ef59b8104d59401
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated, indicating a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the presence of numerous external URIs points to a redirection-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dugedepap.ru/strik?utm_term=grand+history+of+the+realms+pdf PDF link annotation
    • https://zufulakoloti.weebly.com/uploads/1/3/5/3/135301661/7785545.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490138/normal_6022c9de6145f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417118/normal_6052798eba104.pdfIn PDF document text
    • https://ralixuviromod.weebly.com/uploads/1/3/5/3/135345966/e74312f25fc9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409814/normal_5feb7965d10a3.pdfIn PDF document text
    • https://duvupobilalef.weebly.com/uploads/1/3/4/6/134630448/wotipozelava.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413862/normal_602695f08416b.pdfIn PDF document text
    • https://zanomegujinax.weebly.com/uploads/1/3/4/8/134873542/towogifojilonup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494136/normal_600f7bd24de19.pdfIn PDF document text
    • https://jobadenel.weebly.com/uploads/1/3/1/1/131164033/bazozavizirora_zusudu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418369/normal_60277018e88ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426571/normal_5fe4520832eed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb47aba0-ae3d-4cbf-a80a-4f856b6017cc/lejalutuvajirufesevinaxa.pdfIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/avoidance_behavior_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/automatic_transmission_to_manual_transmission_conversion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c591e860-9ad0-46d4-be93-9aecac051ac7/how_to_be_a_dbt_therapist.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dc6299f-c46e-4520-b951-e218bbfdbce3/fenozipanibarikumifiguja.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/jotun_hardtop_xp_data_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/osu_football_channel_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/acronis_true_image_2018_exe.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/dapegixikotoxosemebure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24bcc552-6ea5-4f70-8f37-997ecf2d489a/dr_brown_microwave_steriliser_review.pdfIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/the_atholl_highlanders_sheet_music.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_off00013cb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB4 5416 bytes
SHA-256: 18e05d36c16afab999b63e58d91321a37dc8e9f8cee7b88c2bcaf7551aac2ddc
font_01_sfnt_off00014f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F01 11932 bytes
SHA-256: 251db493db1c3f39d3249f47d58e9247736fda391fe80cb38b2aafecbc6c429b

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