Malicious PDF — malware analysis report

Static analysis result for SHA-256 53cfa951ebedf3f5…

MALICIOUS

PDF

90.4 KB Created: 2020-12-28 21:00:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 46000caa6c238b62b9eeeedd27ac1125 SHA-1: 9dc62f62576e812572eb85f922f2b0041a0e7333 SHA-256: 53cfa951ebedf3f5fcbfdb533092c909116dc67efbdff12dfe48527dceb575fb
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDF files, which is indicative of a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links are sufficient to infer a malicious attack pattern.

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://trafficel.ru/123?utm_term=avenged+sevenfold+welcome+to+the+family+chords PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388835/normal_5f935466dafc7.pdfIn PDF document text
    • https://cdn.sqhk.co/kejofuvata/fgiYVUr/gopataxoxetekigad.pdfIn PDF document text
    • https://cdn.sqhk.co/sezivalaw/gbjfgc7/rubumubetofadatoritaxa.pdfIn PDF document text
    • https://dinoromakutaxe.weebly.com/uploads/1/3/4/4/134479472/9a86593.pdfIn PDF document text
    • https://bomutakarekavag.weebly.com/uploads/1/3/5/3/135330682/pukoliponubopajewori.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386333/normal_5fd814781ef73.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/jiwisigetizoxif/wotizigapemaziruku.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/income_tax_budget_2019_highlights_india_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/trademark_license_agreement_template_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/lipekipuvenuji/27354551497.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/cardigan_form_di.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/likajini.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_off00011459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11459 5464 bytes
SHA-256: 95706b4e73b3701bf34281e30afc080388bac998389feed167260e1784543bbc
font_01_sfnt_off000126dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DC 12240 bytes
SHA-256: 0e8e0ccf12b5a652068fcca629286bcaabccf4632cff6fffaa8035dc946cf211
font_02_sfnt_off00014e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E27 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

Open this report in the interactive analyzer, or submit your own file for analysis.