Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce5faf44e7e7daf4…

MALICIOUS

PDF

85.3 KB Created: 2021-03-01 04:46:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 90ba5dc281416e7447c9f90ef11ba17c SHA-1: 2d2ff2cbc5e953e13c796b9f93217d2a0da7e860 SHA-256: ce5faf44e7e7daf4de8aa4246b5b50cc9a2f0cf87735ce89e8f395f5b611f1cd
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as search results for common queries, indicating a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites for further exploitation or phishing. No scripts were extracted, but the PDF structure itself is used to host and distribute these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://jumiwimov.ru/aws?utm_term=calories+in+dunkin+donuts+small+caramel+iced+coffee+with+cream+and+sugar PDF link annotation
    • http://fixalab.22web.org/tnpsc_app_exam_answer_key.pdfIn PDF document text
    • http://kaxiwemusemoj.mypressonline.com/what_is_the_song_moonlight_on_the_river_about.pdfIn PDF document text
    • https://maradezeg.weebly.com/uploads/1/3/5/9/135974492/vujona.pdfIn PDF document text
    • https://zeduxuvanoripi.weebly.com/uploads/1/3/0/7/130775880/jitino_sekurorebazaz.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/vifexalusomegezobugume.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sujonereduvuk.rf.gd/33656002687.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/kekupuzegupamiduxefev.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/84868926904.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/odd_even_numbers_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/program_chamberlain_universal_garage_door_remote.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/84507797614.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/zugabifamitov.pdfIn PDF document text
    • http://xovolefewawex.atwebpages.com/wodefimebowojurexidamo.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/memutuwebaworugivojopas.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/filter_basket_for_mr_coffee_ecmp50.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/74626324611.pdfIn PDF document text
    • http://topemuzopapegu.epizy.com/13270464557.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/masoom_chehra_nigahen_farebi_status_video.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_off00010f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F08 5496 bytes
SHA-256: e1b9d2fba5616b162e19ef87f7b5321fb3d49d2fff6cd5aa9f76c3a6641e4e6f
font_01_sfnt_off000121a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A1 10952 bytes
SHA-256: 88923cb94efbb5a71ab965881d373e6e3de1ea1543421b8615a3f9862efd722a

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