Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dce69cc6e09de75…

MALICIOUS

PDF

65.9 KB Created: 2020-12-23 10:50:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8627edfe146dd534883964ebfb371607 SHA-1: dc7157141320a0bdc112277a46d1dadfef000523 SHA-256: 4dce69cc6e09de756b4d7daf04b4d30942d399ce5342d71ec9e6afee269beb84
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various domains and S3 buckets. The primary URL, 'https://trafffe.ru/wb?keyword=halloween%20captions%20for%20instagram%20with%20friends', suggests a potential phishing or content manipulation lure. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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://trafffe.ru/wb?keyword=halloween%20captions%20for%20instagram%20with%20friends PDF link annotation
    • https://nofemifi.weebly.com/uploads/1/3/2/7/132710694/1790189.pdfIn PDF document text
    • https://digavonuvuveg.weebly.com/uploads/1/3/4/8/134851043/9357700c09c5.pdfIn PDF document text
    • https://gawokuvaz.weebly.com/uploads/1/3/4/6/134656265/dc12ae9051dbbfb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384155/normal_5f8edf61afee6.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/likadojivivofu/37162155634.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdfda84ff074777c9861e4e/t/5fe07d54ef8e407a9ec35357/1608547670009/suludusukasegefono.pdfIn PDF document text
    • https://s3.amazonaws.com/wutogugej/chuukyuu_kara_manabu_nihongo.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/83404355552.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/chrome_offline_installer_ubuntu.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/modasojexajewakuluxizavex.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/thesis_statement_on_organ_sales_or_donations.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/fopogelo.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/freckle_juice_worksheets_free.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/bosch_series_6_dishwasher_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_off0000c488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC488 5624 bytes
SHA-256: e5a8c81a590cd7f220f64a69964083f05ebb815dfa5200854bbc49b922494daf
font_01_sfnt_off0000d78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78E 10300 bytes
SHA-256: 129ff299c84c6b33e7cf33cd88274bd014987e1e5c711abe54e27926646867c8

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