Malicious PDF — malware analysis report

Static analysis result for SHA-256 88dd733fecb57511…

MALICIOUS

PDF

90.8 KB Created: 2021-03-17 06:45:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 4b8248a6635dda413099ac727d89d1ea SHA-1: 0a1767f844fa3c9cf9b1015d065d6457cb0f1ad6 SHA-256: 88dd733fecb57511bf3f558344252ea00dc96164af002977d68e9c94d2ce5961
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing campaign. The 'SE_INVOICE_LURE' heuristic and the presence of invoice-related text in the document body indicate a social engineering attempt. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://gimoguvi.ru/123?utm_term=invoice+template+uk+excel PDF link annotation
    • http://xazufajemexeb.22web.org/ganexodiroselu.pdfIn PDF document text
    • http://fusafanomogade.iblogger.org/magarusi.pdfIn PDF document text
    • http://mnatural.space/34247321873r9n37.pdfIn PDF document text
    • http://vukuradi.mygamesonline.org/storm_of_swords_chapter_73.pdfIn PDF document text
    • http://bavimobuxadu.medianewsonline.com/what_can_make_your_blood_pressure_high_during_pregnancy.pdfIn PDF document text
    • http://roguvopupo.22web.org/pdf_to_word_ocr_arabic.pdfIn PDF document text
    • http://idealica-columbia.site/reravepufabotevuvauf5w1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4baeb387-8581-43d2-8542-4f7f2477c401/whirlpool_bath_repairs_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/530c5445-3235-444a-ac0c-eb4a02493792/how_to_connect_presonus_audiobox_to_mac.pdfIn PDF document text
    • http://jezevenakos.myartsonline.com/upper_limb_anatomy_quiz.pdfIn PDF document text
    • http://sifebina.epizy.com/learn_arabic_alphabet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad17a72d-33dc-4cf6-8386-19a8daf16df2/32563053183.pdfIn PDF document text
    • http://tunowik.epizy.com/44454743807.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9936599b-c93c-4e57-b7da-a17976e7a0e5/life_fitness_x1_oder_e1.pdfIn PDF document text
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_dc01cb9a9a81465a94b442ac2f3ef6d7.pdf?index=trueIn PDF document text
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_a185c697d81447a8813f0c3937ff5ae7.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_off000127c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C9 4936 bytes
SHA-256: 8f0708d23430510c9247ad95ca6abf76e36747b472267aee6e66ceb1cd607744
font_01_sfnt_off00013890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13890 10672 bytes
SHA-256: ceb1b9f93bdd8a0fa9baaaafa31d440cfa4cd91cd86b1331afc665b5081bf7d2

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