Malicious PDF — malware analysis report

Static analysis result for SHA-256 5504647c292aea84…

MALICIOUS

PDF

78.6 KB Created: 2021-03-10 07:45:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c6574712575d0a24ac60aa0930ffba18 SHA-1: 7f8e3feb49a78ff32bf6c5acab6b3761fde1c58d SHA-256: 5504647c292aea843a24fd9c06359c5e8d443d115b3b18a68cc6c2fd0d8f9045
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' indicating a large number of outbound links. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded URLs likely lead to phishing sites or further malware downloads, and the document body, though heavily obfuscated, appears to be a lure related to educational worksheets.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://lozipotod.ru/123?utm_term=lcm+and+gcf+printable+worksheets PDF link annotation
    • http://smm-target.ru/xeropemebepejl6ylg.pdfIn PDF document text
    • http://xteenware.online/goxotutufyqa1.pdfIn PDF document text
    • https://dorijalasenotom.weebly.com/uploads/1/3/5/3/135327318/313215e8.pdfIn PDF document text
    • https://zalamozosuk.weebly.com/uploads/1/3/6/0/136089451/miladiwetimo.pdfIn PDF document text
    • https://sidusofigogo.weebly.com/uploads/1/3/4/8/134860790/3367211.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gapivegek/forms_of_id_for_employment_in_texas.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/nifalifuniwuxapasax.pdfIn PDF document text
    • https://1350f94c-8d6f-42b4-8351-24983ad6a49a.filesusr.com/ugd/4aae87_433f33ad7cb842a68eea495f831240e8.pdf?index=trueIn PDF document text
    • http://latowetutut.epizy.com/41573094392.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/tesejupukuwokinesasen.pdfIn PDF document text
    • https://28f2c00a-638b-45ec-8848-4d649cb6aba9.filesusr.com/ugd/946f28_0e8474c232244dadb2ca6c44ae4bc032.pdf?index=trueIn PDF document text
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_c7291a1495d045de86916cd6b919d524.pdf?index=trueIn PDF document text
    • http://rifusurevaz.rf.gd/adobe_photoshop_7._0_plugins_filter_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff700f00-e00c-42f6-8623-89a7ec3d11ba/hp_pavilion_dv6_charger_price_in_pakistan.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/bigixafi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3b5cefa-5734-4f75-b86c-895d483b4296/77023651033.pdfIn PDF document text
    • https://s3.amazonaws.com/rivazixexuguri/mifegu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/109d9525-13db-45a1-8498-471de49c5d75/casio_ctk_2400_price_philippines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94930c22-ba98-4492-be30-8b1cad4e4e72/transitive_phrasal_verbs_examples_sentences.pdfIn PDF document text
    • http://vakusidoler.epizy.com/cg_song_mp4_free.pdfIn PDF document text
    • https://7fd92c66-d3af-485c-b7a9-31529ddfb1b5.filesusr.com/ugd/997d0f_3a38b7776ab14eb2a0265e416170c624.pdf?index=trueIn PDF document text
    • http://kezitiw.epizy.com/90575835354.pdfIn PDF document text
    • https://4095172d-bd2f-4181-91d7-dd424e653400.filesusr.com/ugd/df73ab_38a45eb4fea14c94883a0ca9189afbfd.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_off0000f343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF343 5808 bytes
SHA-256: 1e36223ec7161af4900f943eef9dce951f731eab09ff2cb33fdd5a0704c5a72e
font_01_sfnt_off000106f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F5 10540 bytes
SHA-256: 3d19d1640e0f09262243b8ae3eda4f437fa81a439b65e05671abbe99431248e7

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