Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b3e14014dce63bc…

MALICIOUS

PDF

75.7 KB Created: 2021-01-20 15:56:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: dd439c50fa2e0e0ec6223e318b39a72a SHA-1: b35565f90c2de641150aeab06f17b1c4aef292ce SHA-256: 4b3e14014dce63bc64ed1c845060717930ee460a50eaac2ccb33068571866f12
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malware. The document body, though heavily obfuscated, appears to be a lure related to 'reloading press kits for beginners'. The presence of numerous external URIs and the ML_NYX_PDF_MALICIOUS heuristic strongly suggest the PDF is intended to redirect users to malicious sites, likely to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/123?utm_term=best+reloading+press+kit+for+beginners PDF link annotation
    • http://tunizunifegitof.66ghz.com/tonivevomu.pdfIn PDF document text
    • http://zumigiguba.22web.org/uglydolls_movie_parents_guide.pdfIn PDF document text
    • https://bizitaninajoki.weebly.com/uploads/1/3/5/3/135316521/jubokemalabosamib.pdfIn PDF document text
    • https://musabonaxuzu.weebly.com/uploads/1/3/2/8/132815830/zuvipudutonikamefe.pdfIn PDF document text
    • https://guditeni.weebly.com/uploads/1/3/4/5/134529862/05132db.pdfIn PDF document text
    • https://site-1250269.mozfiles.com/files/1250269/27367999640.pdfIn PDF document text
    • http://xabidewukolesas.66ghz.com/zibewizokaxena.pdfIn PDF document text
    • https://lovaxases.weebly.com/uploads/1/3/4/6/134685664/siledejivomozoboni.pdfIn PDF document text
    • https://site-1172681.mozfiles.com/files/1172681/video_helper_plugin_safari.pdfIn PDF document text
    • https://site-1166598.mozfiles.com/files/1166598/61419452177.pdfIn PDF document text
    • https://tipowunukal.weebly.com/uploads/1/3/4/3/134355136/2270267.pdfIn PDF document text
    • https://site-1168007.mozfiles.com/files/1168007/pen_and_paper_icon_in_outlook.pdfIn PDF document text
    • https://beteviduzil.weebly.com/uploads/1/3/3/9/133986260/c3640598.pdfIn PDF document text
    • https://jazitilifa.weebly.com/uploads/1/3/1/4/131414561/gaxefigirebumab.pdfIn PDF document text
    • https://site-1251696.mozfiles.com/files/1251696/33490038172.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/dujepav/loxaterobuzituse.pdfIn PDF document text
    • http://bojonovaja.rf.gd/lenoxerovuxanitalas.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_off0000ebcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCB 5464 bytes
SHA-256: d41d2f3bb9b490237ac1eb18f7ad857e13b6b076af5f394ef3211a0986b9e797
font_01_sfnt_off0000fe6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6F 10356 bytes
SHA-256: 6d58fecb2b93bfa131b044fe1319f4f57b249a8309b2fb8c74d68dc0a144d25a

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