Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbcd2cdc1ccfd224…

MALICIOUS

PDF

70.2 KB Created: 2020-11-17 00:54:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 10962c29c41c58e49ead88174592ff98 SHA-1: e0f6430410986f2a2a71862055c5246cca18b7ed SHA-256: bbcd2cdc1ccfd224e32bb2ef66efd86d8f487bb3dd0185c83a1ebed8690e1885
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 flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, including one pointing to a suspicious domain ('trafficel.ru') and another to a Weebly hosted PDF, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains text that appears to be a lure ('Joe and charlie step 10 worksheet'). No scripts were extracted, but the PDF structure and numerous external links are indicative of a phishing or malware distribution attempt.

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/123?utm_term=joe+and+charlie+step+10+worksheet PDF link annotation
    • https://juzapojoxop.weebly.com/uploads/1/3/4/3/134370352/487510.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/dukajevo/23693967579.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/acer_chromebook_15_cb5-571-c1dz.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/64990676913.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50da8c46-2cbf-4f0d-82ca-947c0407cc8f/87081012411.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12037c9b-37af-4087-a251-ca922d30a2e4/86717120136.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/sevuzixibanemojop.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/inch_bolt_and_nut_size_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21a031fc-9259-4e63-91fd-8829125b1170/46791134581.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/theoretical_naval_architecture_attwood.pdfIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/nefavejusaxomopudisagelin.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/xelavasujakefigotevo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3960507e-e606-4f3e-8383-8ef3619e41e3/72223323785.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e7ffbdb-3482-4026-ab3a-a9ec53e1225e/vagowasividefaf.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/es_file_explorer_pro_cracked_apk_premium.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2eb22aa-debe-4565-aa4a-4f7e9fe7dae0/80051250119.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_off0000cc05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC05 5500 bytes
SHA-256: fc083dd6452279135ef8993432237ad29865da6646ea90ca47b2f1da93104eca
font_01_sfnt_off0000decd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECD 14272 bytes
SHA-256: ed5666cc65259f611b59615936ea04266d04b55b9f797c9b2ec78f672151221c

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