Malicious PDF — malware analysis report

Static analysis result for SHA-256 a33fba85ddbf2024…

MALICIOUS

PDF

78.9 KB Created: 2021-03-26 13:49:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed1f18d61726c7f9412e07d58cee8cd6 SHA-1: 18956771f02dfe2d4ed52efe78e030efecbaba2f SHA-256: a33fba85ddbf20241b24ddc105b519cf22cb86c2f63e063cc8da3fee73eb03e7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm pointing to a suspicious domain 'dafemum.ru'. ClamAV detection and ML classification strongly indicate maliciousness. The document body, though heavily obfuscated, suggests a lure related to 'Christmas eve liturgy 2019', likely intended to trick users into visiting the malicious URL.

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://dafemum.ru/wix?keyword=christmas+eve+liturgy+2019
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sefiwegegagu/ankhiyon_ke_jharokhon_se_old_song.pdf
    • https://uploads.strikinglycdn.com/files/f828c572-6e62-4d81-9aac-004805310f87/how_to_use_zotero_in_word_for_citation.pdf
    • https://s3.amazonaws.com/miwolezedubujoz/tableau_public_link.pdf
    • https://s3.amazonaws.com/sedowedi/72372258161.pdf
    • https://uploads.strikinglycdn.com/files/9cc6ba91-ce59-42ee-840f-ff0a2e8c45b3/how_do_you_work_a_roomba.pdf
    • https://s3.amazonaws.com/garorowa/multiplying_algebraic_fractions_gcse_questions.pdf
    • https://c18d7360-3707-4bf1-9d6f-52ba7510fa17.filesusr.com/ugd/76cb06_91ac8fa8fc3d40ebb51e6e3f0ca056be.pdf?index=true
    • https://s3.amazonaws.com/fefurorobumi/que_es_la_cabala_judia.pdf
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_fb37682e479e4b6083843d857180ba93.pdf?index=true
    • https://1628ddcf-e301-416d-9649-d9339b85441b.filesusr.com/ugd/0b1079_dad0548653ca439c8bfacd4a699bafd3.pdf?index=true
    • http://maxefaronuxugur.epizy.com/industrial_robotic_arm.pdf
    • https://uploads.strikinglycdn.com/files/4c1cc2c0-ffd0-4a69-a167-9bd284b1e8c6/pesor.pdf
    • https://6c49ff76-e13b-46da-8354-2e633d56f736.filesusr.com/ugd/211c2d_64cef0bc64cc4643a9cf5e209304d043.pdf?index=true
    • https://uploads.strikinglycdn.com/files/26414470-e701-4c54-bdce-44cbf7214c26/sum_david_eagleman_summary.pdf
    • https://uploads.strikinglycdn.com/files/c3501d7c-f135-4021-bf2c-86158963469e/sejipipifobi.pdf
    • https://s3.amazonaws.com/tokudapele/charleston_county_jail_report.pdf
    • https://uploads.strikinglycdn.com/files/627fc681-b1c3-48fb-9208-f37febd32954/what_does_an_associate_director_client_services_do.pdf
    • http://pikuvideposem.epizy.com/jobumewizusuro.pdf
    • https://s3.amazonaws.com/vipinib/70810801440.pdf
    • http://wekijedi.epizy.com/nevup.pdf
    • https://s3.amazonaws.com/zidenigad/top_paid_apps_android_2018.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_off0000f5a7.bin
aab9efb28224b31f861cd9dd92b5ec2cb0e4295351d84b989a4c40704a5368db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A7 5648 bytes
font_01_sfnt_off000108b7.bin
61abd639695fb9ed7c74348ac9c37e26b6277739b0b2090cbbc1cb7a46812a9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108B7 10960 bytes

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