Malicious PDF — malware analysis report

Static analysis result for SHA-256 f47f35de1eef7dfe…

MALICIOUS

PDF

66.0 KB Created: 2020-11-09 17:42:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 4d4fdb42e9cb3c37d8d646d13c77f4bb SHA-1: 904aef03ad564c2a700d5c0f994e94e712483d91 SHA-256: f47f35de1eef7dfea18a4eb3a596a52069bc9802c748c14b847c26316aec8b1c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous external links, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm designed for SEO manipulation. The document body, though heavily obfuscated, contains text related to tax payment vouchers, suggesting a social engineering lure to encourage clicks on malicious links.

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://trafficel.ru/aws?keyword=nj+2020+estimated+income+tax+payment+voucher PDF link annotation
    • https://rizadubarezesul.weebly.com/uploads/1/3/4/4/134499036/nufaziragi-xelidik-gonexasex-jovigeseribofa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/259ae827-cf50-4f3d-800e-debd6a7dc7e6/cursed_revenant_divinity_original_sin_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24ea3079-4f92-42d7-bc28-7bfd6000e08d/vibinijanasigo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fc133f9-5836-4c23-a8ea-9a1d1a38f881/rubosizabovawum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0643d35-839d-42ef-8d41-98beed5f7624/clicker_heroes_skill_combo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29511f76-15d2-45d9-8fa2-66beb424af63/16157622380.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/logerujij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c408d4dc-6b82-4762-8b5a-d520407258a3/45023786994.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49a8f38f-1501-4a0f-9f2b-50346f82e041/85963557.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e06c453-836d-4c0e-98a2-3f64758b36d9/76330260617.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a5c6fca-c1a3-4870-a625-dc7fa6acc6cd/49795842109.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13280d68-6bd9-46cd-ac68-324060bde880/72685426641.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38e7c1ae-5512-47ff-9f23-e33d01d715ab/sportcraft_foosball_table_setup.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_off0000c4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A0 5832 bytes
SHA-256: 4bef6f4b0dc48a24c3c88141bc5e83373a7146b633bf8310cb48b77898b54115
font_01_sfnt_off0000d86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86A 10144 bytes
SHA-256: b78b9af2888bbebc16beeeae273e920f75e9d52a2e76b9d1e6e717c913bf0439

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