Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1db4ec51831fbd9…

MALICIOUS

PDF

71.4 KB Created: 2021-03-29 18:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f2b6daa4c82b2e659d94db1b3034b50 SHA-1: 9213f62e6174948f06c64a7e561936f0fff8f51f SHA-256: c1db4ec51831fbd99c371923d0d00f6615dac9d60d3ac3bf94f6bc0333c61a48
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a high-risk heuristic firing for a random URL link, directing users to a suspicious domain. ClamAV also detected the file as a phishing trojan. The embedded URL and the PDF link both point to potentially malicious sites, suggesting an attempt to redirect the user for malicious purposes, likely phishing or malware distribution.

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://xezojetit.ru/strik?utm_term=what+is+rubicon+atlas+curriculum+mapping PDF link annotation
    • http://privateguardingserviceagainstdanger.site/matthew_hussey_free4g7vn.pdfIn PDF document text
    • http://tryporte.xyz/dish_hopper_with_sling_upgrade_cost53frx.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://myluckybet.xyz/51626320002l4ak.pdfIn PDF document text
    • http://luxuwum.mypressonline.com/17399402162.pdfIn PDF document text
    • http://xevijuwidenuxet.mypressonline.com/difference_between_placenta_previa_and_placental_abruption.pdfIn PDF document text
    • http://letgtma.bid/wezegekatiranomomered7vvvw.pdfIn PDF document text
    • http://fordist.ru/bafodusatzyw3.pdfIn PDF document text
    • http://insuranceautousa.com/tuxuvujavusesokowexhqidn.pdfIn PDF document text
    • http://copyrightproblem.com/2013_dodge_charger_5.7_hemi_0-60m9fpz.pdfIn PDF document text
    • http://momentikshop.space/where_does_the_word_math_originate_fromx2izb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c01ec293-a443-4a28-a8fe-15f70596f3a6/sony_rx10_iv_vs_rx100_vii.pdfIn PDF document text
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_6cfda0fc62e7424eab2f365d7db3d4cc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xukirizugukugi/biology_lab_manual_class_11_ncert.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/lord_of_flies_sparknotes_chapter_6.pdfIn PDF document text
    • https://d78d2789-9aef-4bfd-88be-9093bec910ef.filesusr.com/ugd/87a178_634b7c60cd0544a0aa6bfc54e9508bde.pdf?index=trueIn PDF document text
    • http://zaduzos.myartsonline.com/periodic_table_crossword_puzzle_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d12f9a9c-877c-4d78-87e3-dbccb80579ae/sedewugepunuvumozaxizo.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/kukixer.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_off0000d618.bin
80d096556bcaa65ac2fa766cd663fab0ca7d5cbc51ffb6f5e0d5984d3a84310f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD618 5500 bytes
font_01_sfnt_off0000e8b1.bin
29305ec8a8bc2ce1d85c299f41616058761757c1f97e15f9c3a8390cd0010f52		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B1 11156 bytes

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