Malicious PDF — malware analysis report

Static analysis result for SHA-256 727ac20f5b4abc21…

MALICIOUS

PDF

71.4 KB Created: 2021-02-08 17:28:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 4cccb9a6610db0cd620d73164c226f8d SHA-1: a1b9264f1009938bacd1ad6f870e1f414c15b8a6 SHA-256: 727ac20f5b4abc21eaa7386c8b70a9b8db2d9042a2a31e56099c18cb85ec6985
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external links point towards an attempt to leverage external resources for malicious purposes.

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 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.
  • 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.
  • 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://jacksth.ru/aws?utm_term=underlord+strategy+guide PDF link annotation
    • https://cdn.sqhk.co/timadupak/hahhjiB/10979148436.pdfIn PDF document text
    • https://cdn.sqhk.co/ritafase/hjhghew/gaparokedo.pdfIn PDF document text
    • https://cdn.sqhk.co/xonepogafix/gijdMou/5509401112.pdfIn PDF document text
    • https://cdn.sqhk.co/gizetinediz/ezVjcQP/science_journal_for_kids.pdfIn PDF document text
    • https://fikakexuk.weebly.com/uploads/1/3/0/7/130775276/0fe294834a.pdfIn PDF document text
    • http://kigowamukidiba.iblogger.org/aaja_nachle_song_free_pagalworld.pdfIn PDF document text
    • https://cdn.sqhk.co/ragonujip/ggyiegh/98773299639.pdfIn PDF document text
    • https://cdn.sqhk.co/faruzikako/LjTjhgh/reposteria_en_ingles_significado.pdfIn PDF document text
    • https://sididipukiwe.weebly.com/uploads/1/3/1/3/131398020/ralapel_doxube_xolopufeguzito_metubamivevu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gurevetafajes.epizy.com/dusorinajusadurubawiz.pdfIn PDF document text
    • http://kixurazo.rf.gd/91867872087.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/52778408977.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/inks_lake_state_park_fishing_report.pdfIn PDF document text
    • http://pixagikaw.epizy.com/mizonanuk.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/florida_math_book_7th_grade_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/tri_fold_brochure_template_word_2010.pdfIn PDF document text
    • http://bodazovire.epizy.com/appointment_cards.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_off0000dbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC1 5084 bytes
SHA-256: 0658500d19dd73b79af6fe21c1ed90b8acd536a4109b4580c375d91c2217f2d7
font_01_sfnt_off0000ed1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1D 10468 bytes
SHA-256: e6b2dd9a24d97baf0c663956b94c44f613cddf36a2914a096fb7b9ca36239a3d

Open this report in the interactive analyzer, or submit your own file for analysis.