Malicious PDF — malware analysis report

Static analysis result for SHA-256 28959c6af6e9a3fc…

MALICIOUS

PDF

71.5 KB Created: 2020-12-20 02:01:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 2dd3313ec5ece65cea3ade4b68243f02 SHA-1: efe4a1d24dcb09089e0646d32efb6b5be33eaefe SHA-256: 28959c6af6e9a3fc4430cdd39f752e32c3a04d6a96b111267bff2798c1747bcf
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, with one identified as a link farm, suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier also indicate malicious content, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a phishing or malware distribution attempt.

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://traffine.ru/123?utm_term=owl+diaries+books+to+read+online PDF link annotation
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/5346b10051a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0f88bd26ff1194f740ef3/t/5fcb1dd2190ee82df8d7cd6a/1607146963026/rusted_warfare_demo_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/65131083093.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/buzemugefebijeligaweriku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/193afb74-3806-48b4-b477-a290fa0d0582/leaf_anatomy_worksheet_key.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/8_bit_theater_fighter.pdfIn PDF document text
    • https://s3.amazonaws.com/firudegix/enraged_guardian_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a847ae1-244b-4183-8299-4fea61302c6b/sample_curriculum_based_assessments.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4c575a5bc066edfbe6634/t/5fd1e37cb1f692677159939d/1607590782094/download_hide_me_vpn_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/rikoxemarexozunepo.pdfIn PDF document text
    • https://s3.amazonaws.com/tezude/apple_music_low_quality.pdfIn PDF document text
    • https://s3.amazonaws.com/xopugup/head_pump_diagram.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

Related samples 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC44 5144 bytes
SHA-256: dd7615fea8ce1bb8f83a8a966f7dbad48267af903aa00fe475ec61338b86e2d8
font_01_sfnt_off0000eddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDD 10348 bytes
SHA-256: a3e8be5efdd95b8ea54dd3d9908b0f56dd59380dcd564e4f7a7e30d611330232

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