Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc498e0cefea3688…

MALICIOUS

PDF

73.7 KB Created: 2021-06-06 15:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: cd06fab7bef1e2521e34e0cce432c8b1 SHA-1: 06c2f7f90509464e26cc192d0f52731698b3be7f SHA-256: dc498e0cefea3688894debce61eb9c0288db05eddf2bde510b08715aeeb742ba
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many of which are benign, but one suspicious URL was identified. The presence of a 'download button' heuristic suggests a lure to trick the user into clicking the malicious link, which likely leads to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pistant.ru/pbw?utm_term=how+much+is+element+3d PDF link annotation
    • https://zebaraxofalolal.weebly.com/uploads/1/3/0/8/130813897/tefil-parijojakof.pdfIn PDF document text
    • https://tajamexuzoxobug.weebly.com/uploads/1/3/1/4/131410736/3781845.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/e76a3443-5c05-49b5-a912-80bcf3ca8d64/27565261973.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc6b1fd7-a408-4db8-9a6b-2231ee52255d/66287446867.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b765fd09-4b5c-49fd-9cc2-d708409a18ee/615961742.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad25b760-beea-42d0-9d08-6c94bdb1e330/12809463457.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/927a52ef-8bc3-4601-8371-bc7ef6a99e1d/ragtime_doctorow_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e03ed8c-9f97-4bb9-a0dd-fa288f93b791/wemesasazebef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d04c2297-130b-4552-b017-3505e7dadc14/33275170088.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f056ffc-afab-402e-a482-fe1c03e02209/ejercicios_matematicas_4o_primaria_para_imprimir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64780b97-3c96-4b84-9d9f-3af468335a91/how_much_does_pewdiepie_make.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a2252e7-e0ae-4214-8de0-1f5072dd529e/char-broil_big_easy_turkey_fryer_accessories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2577dcaa-bb15-431a-a6be-0449d354d8e1/52538780192.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa16c6cf-bd65-4f95-9da4-8d22066e82ea/little_fires_everywhere_mini_series_review.pdfIn PDF document text
    • http://jotoxipigi.pbworks.com/w/file/fetch/144447399/free_mp3_music_download_app_for_iphone_6.pdfIn PDF document text
    • http://gaguseka.pbworks.com/w/file/fetch/144643206/tetifenudopogixirekuzam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d582249-0c34-474c-ba3d-d0d6a5de1c5e/xofuvarireriso.pdfIn PDF document text
    • http://mizunebapod.pbworks.com/f/republic_ez_spreader_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84fee84e-72d4-4014-b4ec-65590a7b4b6a/beautiful_creatures_full_movie_online_free_movie2k.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e7d37ac-f47e-4c36-ba29-22d7f74094eb/best_medieval_2_total_war_mods_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d67574f-2433-42b9-9113-3b802fc132fd/fedededanovefetebon.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_off0000e511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE511 5092 bytes
SHA-256: eee443b510372a09c753dad3939351f2124491999105f221f08f68cdcac84e6e
font_01_sfnt_off0000f650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF650 10384 bytes
SHA-256: 5fddb484fd90f62db6c2f06bd46f7f87507daef468e48e78c6eba89f6c0dc489