Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7df37add20b5ce9…

MALICIOUS

PDF

70.3 KB Created: 2021-02-27 15:51:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 2753714ab5fca59b80bfa7a78662dcfa SHA-1: c9245f9cc6074993aa4fc74053990b36d611e987 SHA-256: b7df37add20b5ce93074b5ad37b88b15390f8377cf6d183154bb34e29a935b1e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains text related to product searches, which is likely a lure to direct users to malicious sites for further exploitation.

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 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://baarspo.ru/strik?utm_term=are+rheem+water+heaters+reliable PDF link annotation
    • http://idealicaitalia.website/how_to_connect_alesis_mixer_to_computerhu7vz.pdfIn PDF document text
    • http://dosijefa.mypressonline.com/how_do_i_reset_my_dometic_3_button_thermostat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376621/normal_602238e54a6c8.pdfIn PDF document text
    • http://kanaxade.mygamesonline.org/shark_ion_robot_vacuum_r75_with_wi-fi_rv750_reviews.pdfIn PDF document text
    • http://nomenowunesazoz.scienceontheweb.net/weber_grill_parts_serial_number.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365525/normal_5ff0b0cf22ad7.pdfIn PDF document text
    • https://vuzanodunujow.weebly.com/uploads/1/3/5/3/135350892/2e812.pdfIn PDF document text
    • https://dibumofum.weebly.com/uploads/1/3/5/3/135313591/fiwot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448991/normal_6001c73a8ef78.pdfIn PDF document text
    • https://doxekitonibi.weebly.com/uploads/1/3/5/3/135326555/zexilejesove.pdfIn PDF document text
    • http://bimoriz.getenjoyment.net/46541149271.pdfIn PDF document text
    • http://mumolazesinidix.getenjoyment.net/sevuwukabafirerotojirixa.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/sonutopexaramuf/govutixejovu.pdfIn PDF document text
    • http://rosajeku.myartsonline.com/zidetatitiwa.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/35930600964.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_off0000d5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BD 5148 bytes
SHA-256: 6131196eac7a3f08f961f2eab207e6a125a2c5b0fe73d8650317f9847786966e
font_01_sfnt_off0000e71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71A 11048 bytes
SHA-256: d0f47614c89bf1604a0f2351fbe22040b2b6c191cc1f56b1cc8fdbfad68d9054

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