Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf1718368a5cd33…

MALICIOUS

PDF

82.8 KB Created: 2021-03-07 03:42:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 683b7077d7b29f34fe9f3483f6b88db0 SHA-1: 9a8cd0bfcf9cb6532af7193aa06985b77b3478b1 SHA-256: 9bf1718368a5cd339f4aae7df02a2a22edc8f13c9ad6b7c30112d6287a3052a4
146 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • 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://mezovuduw.ru/strik?utm_term=how+to+sync+uniden+cordless+phone+with+base PDF link annotation
    • http://tebapewulodafe.getenjoyment.net/what_did_the_third_estate_include.pdfIn PDF document text
    • http://oneplusonemain.xyz/the_great_gatsby_study_guide_questions_and_answers_chapter_3e5tb9.pdfIn PDF document text
    • http://bionatur.space/american_pastoral_bookk33l4.pdfIn PDF document text
    • http://whowill.ru/how_to_reboot_alcatel_one_touch_fierce_25z4fh.pdfIn PDF document text
    • http://nopezimugabotik.mygamesonline.org/60266770140.pdfIn PDF document text
    • http://worodariravo.22web.org/43096966199.pdfIn PDF document text
    • http://chtotakoebezuz.biz/299702830527humf.pdfIn PDF document text
    • http://savadaqwe.space/340902297229bp0s.pdfIn PDF document text
    • http://cancandance.org/maternity_leave_south_africa_2019_forms33e90.pdfIn PDF document text
    • http://lavkavkusa.store/40376615085al9bx.pdfIn PDF document text
    • http://wikowezenitezo.medianewsonline.com/matikav.pdfIn PDF document text
    • http://fafijitesulexiz.mygamesonline.org/53386927152.pdfIn PDF document text
    • http://winovigamaj.mygamesonline.org/41386791098.pdfIn PDF document text
    • http://yandex-dostav.ru/korean_language_lessons_for_beginnerskqc46.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/800ec2f2-914a-47a7-ba1b-5ae713afd23b/mezeja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a712b21c-0c33-4e36-9ed9-d824841851ae/30366097868.pdfIn PDF document text
    • https://s3.amazonaws.com/zubata/77774667833.pdfIn PDF document text
    • https://s3.amazonaws.com/tezude/xumofetom.pdfIn PDF document text
    • http://majazizekor.epizy.com/vigidazozi.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_off000104ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EA 5456 bytes
SHA-256: 93d996df6c1859aa0c5d5e3c5101cff4ac317f74ef8a70426fb9648dbf5f0a43
font_01_sfnt_off0001177b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177B 11156 bytes
SHA-256: dc894aa08f888018cb20c09b4b678fabe21c092a00b55b40391073a8273621db