Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d1ccfacc6d7e8a…

MALICIOUS

PDF

80.0 KB Created: 2021-03-16 19:45:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c76270a644661ef3f948dd3d3db71f37 SHA-1: 7ef8dc472ecbfaeaf256e241a9c7b16a392ffbf6 SHA-256: 81d1ccfacc6d7e8af5affdd96c8c466a513e5fb401e040b6e0d0d6cab4687cc7
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains a large number of external links, likely to facilitate SEO spam or phishing. One of the extracted URLs, 'https://xajibur.ru/wix?keyword=triple+intervention+adalah', is a primary indicator of compromise, potentially leading to a malicious site. No scripts were extracted, but the structure and link farm heuristic point towards a phishing or content-scraping attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/wix?keyword=triple+intervention+adalah
    • https://mumetimobenuja.weebly.com/uploads/1/3/2/3/132302956/9351461.pdf
    • https://lanizozegew.weebly.com/uploads/1/3/5/3/135309184/fuferijepomagurupo.pdf
    • https://mesaxejako.weebly.com/uploads/1/3/4/0/134097573/e74bd9dd93e91ba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_31efc29881434596a4bc851155126420.pdf?index=true
    • http://vusotinodobofo.rf.gd/22250459647.pdf
    • https://uploads.strikinglycdn.com/files/01127f2f-619f-43f3-a8c5-b6f6dcd9b24a/zorolapib.pdf
    • https://uploads.strikinglycdn.com/files/1cbbf5f7-35ba-4154-94ed-e67ae6f6af09/ritomusodekitufekej.pdf
    • http://nudobovedazopor.epizy.com/mabetusezini.pdf
    • https://uploads.strikinglycdn.com/files/36382da2-40d6-4baa-9c70-fb516227ec87/how_to_open_an_armitron_watch.pdf
    • https://s3.amazonaws.com/perurulexi/blast_from_the_past_full_movie.pdf
    • https://s3.amazonaws.com/musokejixami/punctuation_worksheets_for_grade_3.pdf
    • https://s3.amazonaws.com/lanaladu/calculation_sheet_of_7th_pay_commission.pdf
    • https://s3.amazonaws.com/kavifunaruvi/krups_ice_cream_maker.pdf
    • https://uploads.strikinglycdn.com/files/ce81ae3f-516a-4ca4-9d5b-c1f8f4a4f5ec/stress_management_activities_for_teachers.pdf
    • http://sosirowop.epizy.com/43289489538.pdf
    • https://e0fa0743-814d-41de-b6a5-47f787911882.filesusr.com/ugd/89d2ef_31cca1a4448d462194e4393e180e8498.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2c66ffc6-ffb1-446b-bb4f-40da6aaf7f01/vitapur_water_dispenser_troubleshooting.pdf
    • https://uploads.strikinglycdn.com/files/eb01b768-8554-4641-9e29-bc3370efc662/is_elizabeth_is_missing_a_true_story.pdf
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_7e73215baba04b6898573d0608dfa38c.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea60.bin
f12a9a1cd21985b1e62ff0c5c3e538587ea2170fc34a12954179481b5018994e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA60 5156 bytes
font_01_sfnt_off0000fc30.bin
b610d922a086cd0f5a541b1f56342409f68179d5dbdc551b95399b005dd1351b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC30 4876 bytes
font_02_sfnt_off00010cc2.bin
2b9326379dca627ec67eb88dd38f1a5e2f33fea40c0cbc2fe7df0362f4e38715		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC2 11664 bytes

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