Malicious PDF — malware analysis report

Static analysis result for SHA-256 81633aa45f97430d…

MALICIOUS

PDF

74.7 KB Created: 2021-02-28 02:16:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ba17b18064011133209c9eef229fcc78 SHA-1: d645b016222bf8ed824cf4fecc6e4f6a28e3dff7 SHA-256: 81633aa45f97430d1f17c004dbe6c6a04ccba71dc2b940fb51d18ebeb8df06cd
126 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to disposable domains and are part of a link farm, indicating a phishing or malicious redirection attempt. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. The document body, though heavily obfuscated, contains text related to taking a DMV test online, serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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 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://mezovuduw.ru/strik?utm_term=how+to+take+the+dmv+written+test+online PDF link annotation
    • https://kafasomawupi.weebly.com/uploads/1/3/0/7/130775431/dojinagulojuxe_koluvogatogapuj_jirimubujud.pdfIn PDF document text
    • https://wisamifogafize.weebly.com/uploads/1/3/4/5/134598642/bitufujube_mixemogiru_garogizajata_sitanemizer.pdfIn PDF document text
    • https://dojifidixiwaji.weebly.com/uploads/1/3/4/3/134372722/78ce21c877fcc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387424/normal_5fc6007a2a630.pdfIn PDF document text
    • http://chemistryplus.space/jumpstart_kindergarten_1998_bgmnnrq5.pdfIn PDF document text
    • http://santand-es.com/rekifonuvomeki70ign.pdfIn PDF document text
    • http://mikovil.mywebcommunity.org/13031849424.pdfIn PDF document text
    • https://wixetaduzem.weebly.com/uploads/1/3/4/4/134471786/jelusesokubedeg-pozatap-femozonosegatur-pebilexufego.pdfIn PDF document text
    • http://thiswaytovogue.com/favumenowefejz08sb.pdfIn PDF document text
    • http://rasezatoxefu.mygamesonline.org/29428788270.pdfIn PDF document text
    • https://bejobaxugifupe.weebly.com/uploads/1/3/4/6/134628864/9546137.pdfIn PDF document text
    • http://tewatag.medianewsonline.com/how_to_download_ti-84_calculator_on_computer.pdfIn PDF document text
    • http://rigudozefogo.mypressonline.com/rene_descartes_meditations_3_summary.pdfIn PDF document text
    • http://refoxipixob.iblogger.org/lelijivujomule.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nupowabel.rf.gd/30341744391.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/xupakanumadam.pdfIn PDF document text
    • http://puzexexaniledow.epizy.com/civics_question_answer_class_10th.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_off0000e6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DC 5244 bytes
SHA-256: ebffde70194b14786987841e800e75ecbf2001ff2663e139d14dc1dc96458388
font_01_sfnt_off0000f898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF898 10380 bytes
SHA-256: db8905d7943e66ed06dd2ca3f9288ead3e1248747cb40b4fbc0045179ed1306e

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