Malicious PDF — malware analysis report

Static analysis result for SHA-256 68f31a6f8eee85dd…

MALICIOUS

PDF

64.5 KB Created: 2021-05-10 00:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3028f07ecfcc7e8c53ddfc1567569080 SHA-1: 76fb17c0766362fb85fb6d579baf8f9434d8bcba SHA-256: 68f31a6f8eee85ddf7d7955c7de9288972267f59fb6fc75289453cf2d6cb571e
136 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits a high-severity heuristic for random URL links. The embedded URL points to a suspicious PDF file, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and URL firings indicate a likely attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://chcial.ru/uplcv?utm_term=extent+report+4+java+example
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1d2d88853---memavuviwubudi.pdf
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/6fc51ac4282c4c5bac7fa1b3ee1da8e8/49287144070.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/pesr7i1qpm3ms8fu3gu4kdb3fr/7754765800.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078030538ff7---98476260740.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/e8g46qrmft4mr44dpa2imocfr2/bedukakifesivolipup.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160985608a8ac4---46661461011.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846483414f7---dipogizomaz.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607faf2cca5f7---62671935344.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/38a913d5fc7859d3b986f9a3889d4807/pabetogivura.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090aa82c1d89---44100826179.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdd1c06c02---61610804581.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607964e9d11d8---zafeforosufisox.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/faf1980ef0cabd1de524dd5f80dd8257/javagem.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c620f1701---zixukoripojawod.pdf
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/c2d97ebf37431178d9366b9e683a04e9/godev.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/gktcc8k19lpfr437f5eatuvn5k/nafelelelumaxe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000c247.bin
7734d48f5549c724e78b23e2b7a82c48e221e63ba20c5c0d6a9f5970d3373fbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC247 5036 bytes
font_01_sfnt_off0000d369.bin
668f4ee2f7427763eae4479a519898e2696cefca5cf0d58f101b08dc29d4da52		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD369 9336 bytes

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