Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2b9b84a97857e80…

MALICIOUS

PDF

84.4 KB Created: 2021-05-24 11:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3d4c77f93dda077a9e28f08db0682369 SHA-1: 1789c8a3a81b4ab15d868f0a41d6102e8d6816f2 SHA-256: d2b9b84a97857e800fcbae4bd0a79cc3a78ccb59d6c0e63e015bc98cf25c9fab
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 0.9990

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=converting+polar+coordinates+to+cartesian+calculator PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366402/normal_60354601674d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484633/normal_6017c69d5547d.pdfIn PDF document text
    • https://wuxorazaw.weebly.com/uploads/1/3/2/7/132712222/jowibasorepune-siposasir-livime.pdfIn PDF document text
    • https://duwifugikez.weebly.com/uploads/1/3/5/3/135351140/34e40c430.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402504/normal_6026113fdb118.pdfIn PDF document text
    • https://fogerasiro.weebly.com/uploads/1/3/4/3/134328851/2935975.pdfIn PDF document text
    • https://rudumareta.weebly.com/uploads/1/3/1/8/131871695/7980897.pdfIn PDF document text
    • https://nupetumagapet.weebly.com/uploads/1/3/1/8/131859993/c028b99649.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368493/normal_605fbd9500e0b.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/f4d49420-0277-444f-ac22-f127e76c8abc/libipiziwelijeduwul.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/tuvenuxekafunefokufomadut.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/valkyrie_profile_android_app.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/mevewililit.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/soweto_gospel_choir_songs_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/1659457379.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/jijudib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8525a22e-b7b5-4333-b9ae-28373e6f85b7/can_windwalker_monks_dual_wield.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbe280aa-8575-4fef-91a6-c1a3f5ecdeb2/99785851186.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/wd_my_cloud_not_working_with_time_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a791cb4-e142-417e-bdc7-79b538adc862/mozog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8696618-9b55-4b61-b1dd-adf3bfb35ba2/xunerofujezuluxagaz.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/geekvape_frenzy_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/laginekux/startup_budget_template_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/33826825092.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF026 5208 bytes
SHA-256: d0a2d6eeb391a56a3945bd7d84f8c18c87757dc42b712dbe0cd610d4f6551e2f
font_01_sfnt_off000101ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EF 12076 bytes
SHA-256: c99cf62f4ebcb2b7ebe6989da503ce04dbd15ae4fc358c8f9b097512a772594f
font_02_sfnt_off00012b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3B 16268 bytes
SHA-256: 07f2df4f37edaca140384d534aa17aadaaed08bf77b7bfc7531fb70eb7f9dd00

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