Malicious PDF — malware analysis report

Static analysis result for SHA-256 f87e9ec5b15fb375…

MALICIOUS

PDF

75.2 KB Created: 2021-04-29 17:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5010db5243f198b80eaf620986222867 SHA-1: 7b3089bdac0108950f68d7a67e10a34533f0da24 SHA-256: f87e9ec5b15fb375ea6eca91b80547d7a71a27fce1ace70d9b60edd27adfc17a
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm with numerous external URIs, including one pointing to 'soxebez.ru'. The document body, though heavily obfuscated, contains text related to software tutorials, suggesting a lure to trick users into clicking these malicious links. No scripts were extracted, but the PDF structure itself facilitates the embedding of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/strik?utm_term=microsoft+project+2016+tutorial+for+beginners PDF link annotation
    • http://miraluvofizobe.medianewsonline.com/is_nqf_level_6_equivalent_to_n6.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/jgdhe9w/fall_guys_nintendo_switch_gameplay.pdfIn PDF document text
    • https://cdn.sqhk.co/bapulofuw/dRieigf/jizamopudolov.pdfIn PDF document text
    • https://cdn.sqhk.co/kigimole/ahcRljj/square_enix_software_token_reset.pdfIn PDF document text
    • https://cdn.sqhk.co/lijedubejop/jiWjatv/44690838908.pdfIn PDF document text
    • http://bubobimurasawe.iblogger.org/is_shadow_bone_a_good_move.pdfIn PDF document text
    • http://legugoboxebepe.22web.org/rudewodijuxifafozuriwofiv.pdfIn PDF document text
    • https://cdn.sqhk.co/niserutom/NjghiTA/duvofob.pdfIn PDF document text
    • http://bapitosegapegi.mywebcommunity.org/49791601794.pdfIn PDF document text
    • https://cdn.sqhk.co/foxezevewa/83ujhhj/85291125759.pdfIn PDF document text
    • https://cdn.sqhk.co/dezuvosowato/fhgjavm/34511403166.pdfIn PDF document text
    • https://cdn.sqhk.co/rapavuse/Lgfyngx/39264575737.pdfIn PDF document text
    • http://xokubenafap.66ghz.com/vijenivolanevade.pdfIn PDF document text
    • https://cdn.sqhk.co/retesixabe/12shaDn/25420599005.pdfIn PDF document text
    • http://vevebopawo.mywebcommunity.org/wedimukimefi.pdfIn PDF document text
    • https://cdn.sqhk.co/majukedow/hCeigjc/19131267174.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vajapojaperusu.myartsonline.com/arduino_beginners_guide.pdfIn PDF document text
    • http://forojiwimudobo.atwebpages.com/chordata_notes.pdfIn PDF document text
    • http://mejoxuxo.rf.gd/business_information_systems_download.pdfIn PDF document text
    • http://damusoborubumo.epizy.com/free_math_worksheets_for_5th_grade_word_problems.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_off0000e730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE730 5884 bytes
SHA-256: 6fa2dcda82fff65f6dd21d78ea745a154c24a4c24b8520bbf4ecda2e6731c97c
font_01_sfnt_off0000fb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5E 10600 bytes
SHA-256: fecf8925d5e74e98acab1c88b72bde86e28047e92c3dd38c6a8e64a99ba20fc6

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