Malicious PDF — malware analysis report

Static analysis result for SHA-256 c33110d5ae3218bb…

MALICIOUS

PDF

84.1 KB Created: 2021-03-20 07:52:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f40e8df845f47af0a08945817fbec6ad SHA-1: 7073b30ec7c93b211b9b495bb25eb4cb56d89f49 SHA-256: c33110d5ae3218bb8a7b0e02fb104342d9eec2b0d74eca7fe11b324b951f24b8
164 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xezojetit.ru/wix?keyword=venom+free+download+reddit PDF link annotation
    • http://naxaliref.iblogger.org/fisica_resnick_halliday_volume_2.pdfIn PDF document text
    • http://wotamojami.22web.org/pukojaketegigomivegona.pdfIn PDF document text
    • http://dosefokinuvulo.mypressonline.com/waladulobiso.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/kafitubevomil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/42226173792.pdfIn PDF document text
    • https://27a83426-c768-4525-a63d-b5b732cca755.filesusr.com/ugd/28b3f7_6a2a29e1f32c4b168b986387246d6725.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b83c7df4-f3b3-4a5b-96a2-7fc913006c84/bozavusunuba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e5abe6d-bf28-4ea2-8f81-3f16cc2fdc94/impresora_samsung_ml-2165w_driver_windows_10.pdfIn PDF document text
    • http://fesonukoropirum.rf.gd/monster_illuminessence_remote_control.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/47453230449.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/61269509423.pdfIn PDF document text
    • http://jokubamobivavum.onlinewebshop.net/tibikatugebaw.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/tibixen.pdfIn PDF document text
    • http://jezutax.rf.gd/vetareruxekakowopezoxogab.pdfIn PDF document text
    • https://s3.amazonaws.com/latufenaw/two_wheeler_sale_agreement_format_in_marathi.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/dekekos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f82ffd2b-e8a2-4bc3-966d-bb8c133149dd/wuludopidesetaxarage.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/88201677750.pdfIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/compressed_sheet_mask_watson.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/bangla_krishi_boi_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/numerical_and_statistical_methods_for_bca.pdfIn PDF document text
    • https://tinyurl.com/HDFLIMCONCTIn PDF document text
    • https://tinyurl.com/newhdflimIn 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_off0000f50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50F 4932 bytes
SHA-256: 4d9839e1a5943eeec2e2c7d54bf11b3f99edbfed6a2671f1529023aa3f6cecf8
font_01_sfnt_off000105d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D2 12000 bytes
SHA-256: 751d3ab909d018cd6478bdbdb44e3a1d9969718db48db13b4b092c6d37ba158e
font_02_sfnt_off00012e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E31 16064 bytes
SHA-256: 1398bbf2dfd9cae4409d1d8ab67a79f495e147aa07cce54436be1c2862721d78

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