Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c617e761a8dbd32…

MALICIOUS

PDF

73.1 KB Created: 2021-01-13 19:22:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 75284c520bae8bcf8b3420966f33ff1a SHA-1: c917b3b4bc0b4741203130daf1b52aa9243d1959 SHA-256: 6c617e761a8dbd32eab240672d6e35a0c8dcbbc6b8b8e6b3431767d4519f7d67
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'link farm' pointing to various PDF documents. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffking.ru/aws?utm_term=android+auto+ford+sync+3+bluetooth PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368493/normal_5f9860cf1402b.pdfIn PDF document text
    • https://jakilirimilibev.weebly.com/uploads/1/3/4/8/134862861/7615578.pdfIn PDF document text
    • https://site-1168172.mozfiles.com/files/1168172/migizepexutipikan.pdfIn PDF document text
    • https://pisubemiduburor.weebly.com/uploads/1/3/1/3/131380627/kamebifakinumab-kidudufof-lunekipaxagowuv.pdfIn PDF document text
    • https://migawonakizize.weebly.com/uploads/1/3/1/6/131637147/a1cd82966a8.pdfIn PDF document text
    • https://foposivore.weebly.com/uploads/1/3/4/4/134472686/jebedol-xuvesavuxujev-kixatitupu.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/bejokazemur/bahubali_2_tamil_movie_tamilrockers._gr.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/fighting_arcade_games_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/maplestory_4th_job_advancement_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/misused_words_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/81749523132.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/bsphcl_assistant_notification.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/zajuwojoxurubabalasole.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_off0000e1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E3 5504 bytes
SHA-256: b91db983c6e63150ee0bbd187eb68306ccfcf7f2df6cfcc2d226b22ceffd75b2
font_01_sfnt_off0000f49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49C 10360 bytes
SHA-256: 47c9f39163b4894bc82ee10bf8eace33dad488bd43aaa087550e0788f13badf5

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