Malicious PDF — malware analysis report

Static analysis result for SHA-256 2388fca2d88e2420…

MALICIOUS

PDF

69.4 KB Created: 2021-03-20 02:28:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: b89c3958fa1e0ab6183be5705e817f08 SHA-1: 0f47b8e52290014d07b121159b0dc2e1476c1d10 SHA-256: 2388fca2d88e2420bf311ef2ffee43af0c0b6246c8f18c2916a0ace2971add21
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are SEO-optimized and point to other PDF files, suggesting a link farm or content-spinning operation. The primary URL, 'https://ponafet.ru/wix?keyword=mass+volume+density+worksheet+6th+grade', is presented as a worksheet, likely a lure to direct users to malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/wix?keyword=mass+volume+density+worksheet+6th+grade PDF link annotation
    • https://pibowalemarume.weebly.com/uploads/1/3/1/1/131164440/742383.pdfIn PDF document text
    • https://kekufekogaj.weebly.com/uploads/1/3/4/7/134768560/7952910.pdfIn PDF document text
    • https://cdn.sqhk.co/wufevinek/7Whjjfb/lion_temple_run_game_free_download_for_mobile.pdfIn PDF document text
    • https://zememaxuzibur.weebly.com/uploads/1/3/5/3/135326459/45db8411a.pdfIn PDF document text
    • https://bozuwosumexoxal.weebly.com/uploads/1/3/2/6/132682772/75390da596.pdfIn PDF document text
    • https://jubipolofolexi.weebly.com/uploads/1/3/2/3/132302872/lovonewenaju.pdfIn PDF document text
    • https://xaviloxoganobe.weebly.com/uploads/1/3/1/3/131383750/4aebab2144fc.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwosexed/Qje2mom/all_on_my_own_les_mis_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/wukikanas/boegihi/sugaridusemenepozuzi.pdfIn PDF document text
    • https://vodesaladamaju.weebly.com/uploads/1/3/5/2/135298616/zufawaludowokifadixa.pdfIn PDF document text
    • https://tavefagizukog.weebly.com/uploads/1/3/0/7/130775361/e4f905170b31.pdfIn PDF document text
    • https://mavakonagidesa.weebly.com/uploads/1/3/1/4/131483278/mefikepaxunam.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/forupokisip/automate_excel_sheet_using_java.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/lezigebitokanutejewakaf.pdfIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/baby_bjorn_travel_crib_light_fitted_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jizubisetebof/bubble_letters_font_free.pdfIn PDF document text
    • https://cfae799c-d04a-4395-b2c2-700dffd2ed5c.filesusr.com/ugd/15504a_50ea2b40ee1b4640adfb105380834c5d.pdf?index=trueIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_cf74c9caf65b4e9780f55997fdd537ea.pdf?index=trueIn PDF document text
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_6a57e0535c674194a57f3a070df2d776.pdf?index=trueIn PDF document text
    • https://1b15a19f-c8c2-4d9d-8c2f-e97aa7ecfe2c.filesusr.com/ugd/eb6c48_e34edab0b3834bb78aae61df91e7db02.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/backflow_preventer_repair_manual.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_off0000d120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD120 5716 bytes
SHA-256: 2e2704ef806b68b81c6fdc35e362a8c59593981638cbf7d3a0c0aa18e38df7e6
font_01_sfnt_off0000e491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE491 9816 bytes
SHA-256: 30327883e3aa233b535d2cfbe4052c020756c0024874e9830634804032b140b9

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