Malicious PDF — malware analysis report

Static analysis result for SHA-256 84b87a1ea660aa3d…

MALICIOUS

PDF

80.9 KB Created: 2021-04-04 09:26:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c96ed9da116d6af5cc88772a1dbc8ad1 SHA-1: e6ed5473cdd0f8f8d8e1c82af5a0ca7bc3a0e6d5 SHA-256: 84b87a1ea660aa3dbb4a913ec351c4ccc1d8dae52c967d726ce5db4d56326395
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 file contains a large number of external links, suggesting a link farm or phishing attempt. The embedded content, though partially corrupted, appears to be a summary of 'Romeo and Juliet' intended to mask the malicious nature of the document and its numerous outbound URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=romeo+and+juliet+act+1+scene+3-5+summary
    • https://kofasarafafe.weebly.com/uploads/1/3/5/3/135390193/tobaxi.pdf
    • https://roxasudafuj.weebly.com/uploads/1/3/0/7/130740166/fitatozobudikoba.pdf
    • https://kitopelok.weebly.com/uploads/1/3/4/3/134355781/6752506.pdf
    • https://duzikasaropofe.weebly.com/uploads/1/3/4/4/134489835/7514748.pdf
    • https://gagakulusete.weebly.com/uploads/1/3/5/3/135326625/vijusa-kisuxulat-rivodifus-gamulewud.pdf
    • https://dezijetide.weebly.com/uploads/1/3/4/8/134864221/vozifuvabexuko_sufataxujemom.pdf
    • https://pivozedotafi.weebly.com/uploads/1/3/1/0/131070355/kukolafure.pdf
    • https://pifabevab.weebly.com/uploads/1/3/4/7/134721676/feloduduvib-fajat-tupar-jizamabuluguwez.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/cad2d6a3-3398-492f-a721-fe514af0fadf/21087931186.pdf
    • https://3d5b2cfc-74f5-4c02-8466-0d369b02955c.filesusr.com/ugd/69b86f_5b6636dbdf264e6da1b1d508f376b7bd.pdf?index=true
    • https://95a83a18-022f-4aa5-9dc2-588eac4c5c4a.filesusr.com/ugd/ccb6ab_90f7bb56f7e244a9acfac169853ab821.pdf?index=true
    • https://6c71f620-b6e5-46cc-9e58-526c5f0a7a41.filesusr.com/ugd/1c90dc_fef0ba7ef3144f2d854e76525d1ddcbf.pdf?index=true
    • https://2863666b-9d79-467d-9aad-9eeb6dafbdf2.filesusr.com/ugd/6ee3eb_30c445e578a44911b73ed95ddbcca866.pdf?index=true
    • https://b64dd490-e5b9-492f-89ff-e398ecee904c.filesusr.com/ugd/5926b4_3baafc03bf2949748e5b9a24ccf32c82.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cf1b3f1a-83b2-4cb1-991f-a18b735b0c1a/74021110878.pdf
    • https://uploads.strikinglycdn.com/files/0617aece-1efe-429b-9f7b-6add6932828b/93234978737.pdf
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_291ca792defa48ebbfc99e238559125e.pdf?index=true
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_4e6cf169e51744e8b459bff493fe0cf6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/91e2639b-a7b8-4e67-90f8-f8ba68cb007c/with_winning_in_mind_audiobook.pdf
    • https://uploads.strikinglycdn.com/files/129806b0-7130-48cd-9f2d-425c96820b02/sipuribebopawotawekerif.pdf
    • https://e0ff2378-281a-4ea3-95ae-419c526fdc99.filesusr.com/ugd/0baf77_aad3ce6815344bdcb3b9604939969abb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/67cf5fc4-0075-4a1e-a826-288a0ccf0434/samsung_rs261mdrs_ice_maker_not_dumping_ice.pdf
    • https://uploads.strikinglycdn.com/files/d618e379-a786-473a-9546-5030413d66de/willmingtons_guide_to_the_bible_digital.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_off0000fd21.bin
df45e515c34b6fa6db65d32e149c451ccd0ee6349d16dbc5440f208f54355661		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD21 5640 bytes
font_01_sfnt_off00011057.bin
ef0d514dfd2fc9cae461b8113f30c67864a5290f6c54278bdce6c0f2f3f52ac7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11057 11064 bytes

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