Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c90b519125f841b…

MALICIOUS

PDF

79.9 KB Created: 2021-03-21 01:07:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4e2befb4a173b568366012ce5e590453 SHA-1: abd6c3af0990fbb7c0547f2b5694765da6cdd99f SHA-256: 5c90b519125f841b1b220b9de85ddb06f89c337dad8e8ed19886edd74329fdef
234 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, including detections for malicious redirector links and a link farm. The document body, though partially corrupted, contains text suggesting a callback lure related to accessing a Toshiba office phone voicemail, consistent with a scam or phishing attempt. The presence of numerous external links, many pointing to PDF files, indicates a potential effort to distribute further malicious content or engage in SEO manipulation for phishing.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/strik?utm_term=how+to+access+voicemail+on+toshiba+office+phone In PDF document text
    • http://jelesanu.iblogger.org/dreamweaver_cs6_tutorial_creating_a_website.pdfIn PDF document text
    • https://kitedagipan.weebly.com/uploads/1/3/4/8/134892955/zagodevix.pdfIn PDF document text
    • https://zuwukozoxuwiged.weebly.com/uploads/1/3/4/7/134713444/3858514.pdfIn PDF document text
    • https://womominajarizu.weebly.com/uploads/1/3/5/3/135392323/fed889.pdfIn PDF document text
    • https://bibomezu.weebly.com/uploads/1/3/2/7/132710601/datawarosudavizade.pdfIn PDF document text
    • https://pixamowogiru.weebly.com/uploads/1/3/4/5/134590731/bifotubarojulul.pdfIn PDF document text
    • http://fogazino.iblogger.org/674376812.pdfIn PDF document text
    • https://vobijiwemifi.weebly.com/uploads/1/3/4/6/134673224/7215227.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://turixupifebut.epizy.com/bmct_terminal_berthing_report.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/felalop.pdfIn PDF document text
    • https://413f70bc-0247-4a04-a3fc-eabb14e2b93f.filesusr.com/ugd/f18ee6_a6db5a63714640caa866c00ab9cd36e0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bokofapig/70901220337.pdfIn PDF document text
    • https://s3.amazonaws.com/gonasidupij/10934117049.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/8757769485.pdfIn PDF document text
    • https://e1318bff-d970-45e2-bcea-45481503a18b.filesusr.com/ugd/75a96d_f85a312a57a343899e530f9fd4987a72.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jotizifime/interior_angles_of_irregular_polygons_worksheet.pdfIn PDF document text
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_9251c40648b448749e3ba0df456185b6.pdf?index=trueIn PDF document text
    • https://f22a9904-e884-4e4b-b219-c70c7d184214.filesusr.com/ugd/a298ce_bcd7073ee56e436f9d91c5e55da92668.pdf?index=trueIn PDF document text
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_db518ef462144c9d8918346e559e53bf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/the_end_of_evangelion_music.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8C 5200 bytes
SHA-256: df515e09087ca9e9c11fe90b58c0b1651ce88ad93002a601b5d0801e1aa84e1a
font_01_sfnt_off0000fe19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE19 11048 bytes
SHA-256: 7a6429a2f2ce28613ed9717654b3332ae6db5b338295883b8421e5843d3d046c
font_02_sfnt_off000123b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B3 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333