Malicious PDF — malware analysis report

Static analysis result for SHA-256 94c71518cd4bf88f…

MALICIOUS

PDF

114.6 KB Created: 2021-03-29 06:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76d43e3a60a0db18acf3ab8c30ed7870 SHA-1: 6f43149f1e1d23c09ef8f0406a9db03d196e79f8 SHA-256: 94c71518cd4bf88febb693d50f1ec4606e0383df4fd2b8d7958dbbd891495f11
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to 'xezojetit.ru', suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate maliciousness. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a common tactic to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/123?utm_term=charity+agm+minutes+template+uk
    • https://cdn.sqhk.co/datujisukebe/gihbWjd/72459402741.pdf
    • https://metolokinazez.weebly.com/uploads/1/3/1/4/131452743/9990960.pdf
    • https://bowalizixoled.weebly.com/uploads/1/3/1/8/131872289/5425770.pdf
    • https://cdn.sqhk.co/dugelabomaw/hfjeCHM/kabubevigiw.pdf
    • https://cdn.sqhk.co/liralimujote/hhd0Bgi/77882759457.pdf
    • https://fodubimofo.weebly.com/uploads/1/3/4/8/134884763/soputilus.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zomimuju.rf.gd/smc_cylinder_free.pdf
    • https://1a2149e7-ca7f-4e7c-a584-0e483de6f3af.filesusr.com/ugd/9219f8_ec0d6875f9214019b83f2f4a8e3fa709.pdf?index=true
    • https://s3.amazonaws.com/dudujopixejikug/attack_on_titan_season_4_how_many_episodes_will_there_be.pdf
    • https://1e438cd7-6f3b-42ac-a97b-d13a75fa135b.filesusr.com/ugd/0c268c_d3fe061a59344dc3b0baa28ba84732a0.pdf?index=true
    • https://s3.amazonaws.com/setaxilitozuko/vosazozax.pdf
    • https://s3.amazonaws.com/nagudo/how_to_tell_if_it_is_covalent_or_ionic_bond.pdf
    • https://s3.amazonaws.com/tipikaxe/economic_order_quantity_questions_and_answers.pdf
    • http://kuzibawo.rf.gd/acrobat_pro_free_trial.pdf
    • https://e321b6f2-2a0a-4c58-8c60-26baf46d82f1.filesusr.com/ugd/14900c_23fc9bd2bb2e41ae82b46abe5f5da95f.pdf?index=true
    • https://s3.amazonaws.com/zidosozawok/silicate_mineral_crossword_answer.pdf
    • https://aa6d2f86-95e2-42cc-897e-6bbd71c3a116.filesusr.com/ugd/78daac_9b291b88414f40b0b3a726ec06b17ebe.pdf?index=true
    • https://s3.amazonaws.com/sikuva/java_for_linux_7.pdf
    • https://s3.amazonaws.com/dojivewobasuval/structural_family_therapy_case_conceptualization_example.pdf
    • https://s3.amazonaws.com/dikobepibelun/how_much_does_a_hot_springs_hot_tub_cost.pdf
    • http://dakekamuma.rf.gd/39377172277.pdf
    • http://xuxusemo.epizy.com/apostila_cade_simu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001845c.bin
3524d4c935f5d2274b8d418b7f489b44c1173637a007386edd80c9ae890b7c8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1845C 5304 bytes
font_01_sfnt_off00019645.bin
77cd8b8f7b6895b7023b43a60517f7b1b1448fd80cdd22a695722cba2f504eb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19645 11256 bytes

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