Malicious PDF — malware analysis report

Static analysis result for SHA-256 733661a56ef5f9ea…

MALICIOUS

PDF

78.2 KB Created: 2021-03-27 22:57:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: ab896c63303378b6964c0e09b1d6149a SHA-1: 9483db9803cb6b9aaad8870534c262827f575849 SHA-256: 733661a56ef5f9eab95627d98483b6dd7f6a357db7c98900aaac3e018ec8764d
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO spam and phishing. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' indicate a large number of links pointing to redirectors, with one prominent URL being 'https://jottigo.ru/wix?keyword=apollo+physical+and+personality+traits'. This URL is likely used to direct users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jottigo.ru/wix?keyword=apollo+physical+and+personality+traits PDF link annotation
    • https://jedunifoxawixe.weebly.com/uploads/1/3/4/4/134458330/7100720.pdfIn PDF document text
    • https://dewokipapofoz.weebly.com/uploads/1/3/2/7/132741709/a346c412e7ca9.pdfIn PDF document text
    • https://duxuxapuxud.weebly.com/uploads/1/3/5/3/135332588/pusuwodavenena.pdfIn PDF document text
    • https://jafadunew.weebly.com/uploads/1/3/4/6/134632108/d35be043f533c7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d25e5d79-f3dc-43ab-8538-58f2f4730235.filesusr.com/ugd/898300_d143ce5625a14c3c9f6cfdd50eedeb92.pdf?index=trueIn PDF document text
    • https://45ed8376-e832-497f-ab20-0a31924dc5db.filesusr.com/ugd/4b7290_8a94513912f642419b88e7cebcdf9abd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lebaxa/goxofupimadupabokubilik.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/how_to_remove_samsung_tv_stand_lcd.pdfIn PDF document text
    • https://486bfeb6-87d8-40a3-812f-3449909c9139.filesusr.com/ugd/81b904_64d8d6098bf44832871abf0b747328f3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/inches_to_centimeters_conversion_table.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/inverse_and_composite_functions_worksheet.pdfIn PDF document text
    • https://86a6be6f-1c3f-48a2-98e5-8a654ddc1212.filesusr.com/ugd/027f51_b22bd0f9ceef489ca6bfbb457862faca.pdf?index=trueIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_b2922319724f41b79aaa6c6a765a062d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/examples_of_critical_thinking_questions_for_college_students.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/97147023339.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/nursery_rhymes_songs_lyrics_and_chords.pdfIn PDF document text
    • https://s3.amazonaws.com/lekezaru/british_medical_journal_case_report_format.pdfIn PDF document text
    • https://f187853a-68e6-4ed6-a420-9593b89d6738.filesusr.com/ugd/27c34a_ea3f89f0565a426a8dd67cfe83699253.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gonasidupij/68891982022.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/sato_cl4nx_driver_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/gurisuxovasufuzon.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/55154337572.pdfIn PDF document text
    • https://b354d503-40d1-4c97-84b4-bc0b16c12f35.filesusr.com/ugd/8c7d07_54f208fd0f2c4833bfe10633ee2ad1fc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/71388038435.pdfIn PDF document text
    • https://ce3a146a-d504-4efb-981c-4593fb85d965.filesusr.com/ugd/5b5da7_8b289c0795c342a1b40fc5f29b2bd06b.pdf?index=trueIn 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_off0000f216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF216 5252 bytes
SHA-256: ccfeaad3291bb4324177fbd444aa7f5fc4059fe0985e83e2fc602cd9c61224ec
font_01_sfnt_off000103f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F1 10936 bytes
SHA-256: b4752e199a57ad43fe2f528babcd440fc8fd732c6b0c47492de6dd0c615edd59