Malicious PDF — malware analysis report

Static analysis result for SHA-256 028135571c566c3e…

MALICIOUS

PDF

64.3 KB Created: 2020-12-19 02:11:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 329aeb8f64d59ee6a902b6f052656846 SHA-1: 64b9490287b7ee41040eba466b5ba3e937a4a54a SHA-256: 028135571c566c3ec53b4ea8d2d544e51a6698720ffc567322c324a67372704b
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded external links, many of which are likely part of a link farm designed to direct users to malicious sites. The document body, though heavily obfuscated, suggests a lure related to "basic plc programming book pdf". No scripts were extracted, but the presence of numerous external links indicates an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/aws?utm_term=basic+plc+programming+book+pdf
    • https://topifovav.weebly.com/uploads/1/3/4/5/134595147/tomaga-kiwilolasilede-xiguvis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3106ce6f-7696-4432-8ed2-dc13df1f9254/creative_chordal_harmony_for_guitar.pdf
    • https://s3.amazonaws.com/divelatoxa/lubomepate.pdf
    • https://uploads.strikinglycdn.com/files/0fc24d67-8584-4b27-8201-961ee637fde9/descargar_daemon_tools_lite_gratis_mega.pdf
    • https://uploads.strikinglycdn.com/files/184738f4-a9af-425f-bbd2-11d1e62bb91a/kanuxunoli.pdf
    • https://uploads.strikinglycdn.com/files/7633dfe0-cf57-42cf-a0ae-d9213d503ae3/retuvif.pdf
    • https://uploads.strikinglycdn.com/files/e6990db3-b050-4de3-ba73-c0d809590cde/ravnica_allegiance_limited_guide.pdf
    • https://uploads.strikinglycdn.com/files/c7c8ea79-a992-4931-9ff8-c52c05159a61/16061659295.pdf
    • https://uploads.strikinglycdn.com/files/944278d3-b30d-43d7-bdf6-a40c8f7fcfaa/manual_receiver_pioneer_vsx_305.pdf
    • https://s3.amazonaws.com/kawotexulozax/fake_divorce_papers_georgia.pdf
    • https://s3.amazonaws.com/suzixegazunow/unblocked_masked_shooters_assault_weebly.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc99.bin
23a3bb73ca49c1e56aab922b3cd5bd7f6206f5f90516eec3e561affa5cf6dfc5
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC99 5728 bytes
font_01_sfnt_off0000cffe.bin
a7bd0efb689fbee8dd8ce5a8df5da65f84c4d4a8e2a55bc6839f0161a3113450
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFE 10996 bytes