Malicious PDF — malware analysis report

Static analysis result for SHA-256 6170abe832d082d5…

MALICIOUS

PDF

75.0 KB Created: 2021-02-20 07:38:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 08cdb8445a3f096e1ce42ac60db78041 SHA-1: 9513cbaabe148cd630df07e7a4d2072614e6dc41 SHA-256: 6170abe832d082d5a2b9929dfa0e27246a8dc95ae3e1a89252d979aa0a13614e
156 Risk Score

Malware Insights

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

The PDF document contains a lure related to resetting a Samsung flip phone, directing users to a suspicious URL. The presence of a large number of external links, many pointing to PDF files, suggests a link farm or SEO poisoning tactic. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing or trojan variant.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=how+to+factory+reset+a+verizon+samsung+flip+phone PDF link annotation
    • http://aycotoro6.xyz/57662516931sjdf3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475989/normal_602189654ef4d.pdfIn PDF document text
    • http://silkhfig.bid/can_i_watch_inferno_on_netflixwm53f.pdfIn PDF document text
    • https://cdn.sqhk.co/kuruwoke/SLCyjJg/giduluz.pdfIn PDF document text
    • https://dexazime.weebly.com/uploads/1/3/1/4/131437554/furokufubonakeg.pdfIn PDF document text
    • https://cdn.sqhk.co/kelulegawi/r4mji9E/falling_fred_online_unblocked.pdfIn PDF document text
    • http://covidcapsule.world/8453463802c2dxb.pdfIn PDF document text
    • http://aicberg.net/le_futur_simple_exercices_corrigslzvi7.pdfIn PDF document text
    • http://reduslimitalia-official.site/difference_between_wavelet_transform_and_fourier_transformzzrt0.pdfIn PDF document text
    • https://cdn.sqhk.co/kagaxavog/fhfifhj/do_it_yourself_electronic_projects_kits.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/bogeguva/nugisa.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/virginia_boating_safety_course_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/20259694684.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/how_to_fix_toto_washlet_wand.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_off0000d971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD971 5576 bytes
SHA-256: 46898a535821d2b1f472eb29c7b539850fe932a81856c00282eac66714ddb505
font_01_sfnt_off0000ec63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC63 10728 bytes
SHA-256: f59cc76e2e10091a2c6b0621a38a75e42ae1cb26ef463a0410e0855797090e07
font_02_sfnt_off00011091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11091 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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