Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3e530f7804f06df…

MALICIOUS

PDF

77.9 KB Created: 2021-01-12 20:10:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e900b6851324f4672810395a73218118 SHA-1: 7930184681f5fee6673ced965b0a7c4936e8128c SHA-256: d3e530f7804f06df7e5c949203933cc9649cd95ff6560ce8ed3d842e376b6708
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting an attempt to direct users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

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://trafficel.ru/123?utm_term=rhythm+in+motion+dance+studio PDF link annotation
    • https://site-1175775.mozfiles.com/files/1175775/live_five_news_election_results.pdfIn PDF document text
    • https://muwegejise.weebly.com/uploads/1/3/4/2/134265646/c742eaf8b2a.pdfIn PDF document text
    • https://site-1175023.mozfiles.com/files/1175023/horror_vr_videos_download.pdfIn PDF document text
    • https://site-1222023.mozfiles.com/files/1222023/sir_anticoagulation_guidelines.pdfIn PDF document text
    • https://xujifedivo.weebly.com/uploads/1/3/4/8/134862591/jibosexurawipop-dofodowewefek-putajaduj.pdfIn PDF document text
    • https://tanifovekula.weebly.com/uploads/1/3/1/3/131379991/xakixatovoji-gezejojufe.pdfIn PDF document text
    • https://site-1233507.mozfiles.com/files/1233507/pronunciation_guide_french_audio.pdfIn PDF document text
    • https://xuberirerumona.weebly.com/uploads/1/3/4/5/134586272/jubiluwobabuwavo.pdfIn PDF document text
    • https://digulowewuw.weebly.com/uploads/1/3/4/3/134363346/lesuranifuferulim.pdfIn PDF document text
    • https://dujibirarikow.weebly.com/uploads/1/3/4/3/134321406/3064292.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/fejatepudopito/canon_eos_80d_firmware.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/zowufemawututenobu.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/42328160726.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/acidosis_lactica_metformina_y_alcohol.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD441 5160 bytes
SHA-256: 88e2df4cc7c63c21d1a1b1f1c399454f103c9db89e006fe935b9ac98beb2840f
font_01_sfnt_off0000e5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AA 2280 bytes
SHA-256: 36e1b0a883dc0d9c2d9a1a61c12d6654059dcb396fa4bb11bd6b549737bac84a
font_02_sfnt_off0000efe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE3 10628 bytes
SHA-256: 54dd58bbe9737c28e47541f4f122cb27afc9d0f1b2e8d583a1a335873ceebf31
font_03_sfnt_off00011448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11448 16364 bytes
SHA-256: 95d522b2cf51f52bb926ac6861ff29a9d2946bad1fed2b3ffd2649bccaaf56d0

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