Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a4c1fa61af000e3…

MALICIOUS

PDF

78.2 KB Created: 2021-03-29 04:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 88b562f9151f4f4140b57bbf57b0c557 SHA-1: 52bda9bff7f69eecd701692d40d896b2ca666f6c SHA-256: 0a4c1fa61af000e3e1ed9286683a5f57304672256ffe32c0ff472a0bbcffd2c4
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://xajibur.ru/award?keyword=voiced+and+voiceless+sounds+in+english+pdf PDF link annotation
    • http://xulodol.mygamesonline.org/buds_training_program.pdfIn PDF document text
    • http://vaxisezawoged.scienceontheweb.net/business_proposal_letter_format.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412396/normal_5ffc6bf8ab97e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370778/normal_5ff286fe77ffb.pdfIn PDF document text
    • http://runojiwum.getenjoyment.net/11512563277.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481162/normal_5ffb0b6fe52fc.pdfIn PDF document text
    • http://rogijowop.sportsontheweb.net/mesepozawiwanige.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482623/normal_60436dd9b618a.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/somamere/arellano_university_malabon_application_form.pdfIn PDF document text
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_fe56ccf10f314fa1bbbe1282f0a3f794.pdf?index=trueIn PDF document text
    • https://9dd02728-8b0e-4c16-8a5b-31b14a6ec887.filesusr.com/ugd/d8c3ed_789ce593e9384057bdaf2e3fff468f8e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/garorowa/29017593445.pdfIn PDF document text
    • http://riboparewi.rf.gd/jokopesudat.pdfIn PDF document text
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_4bffc22b20c7403481ea3c5f2fa5273d.pdf?index=trueIn PDF document text
    • http://joriboka.epizy.com/numark_mixdeck_express_multi-format_usb_dj_cd_controller_system.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/biblical_training_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/2111260830.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/liftmaster_8355_garage_door_opener_reviews.pdfIn PDF document text
    • http://fegedenem.rf.gd/daily_hourly_planner_template_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/bloch_dance_shoes_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/free_pet_adoption_day_chicago.pdfIn PDF document text
    • https://cf21b241-1edd-4e7a-8b85-4b7fa12bec5a.filesusr.com/ugd/835652_11490beaa2b34f5d849a7090d81b82d9.pdf?index=trueIn PDF document text
    • http://rokabimokow.rf.gd/water_borne_diseases_notes.pdfIn PDF document text
    • https://ecf8b3bd-8201-449f-a39c-156acd88681e.filesusr.com/ugd/97634b_5ef9389f26314d17a692d861bf4b8592.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/answerable_to_anyone_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/business_card_label_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/zozatemu.pdfIn PDF document text
    • http://tinozireru.epizy.com/crazy_stupid_love_movie.pdfIn 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_off0000f3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A3 5348 bytes
SHA-256: 44bb970ee82596604be0faeb1a3df59d3f45188e9604f143928f7170cf24f292
font_01_sfnt_off000105e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E3 10924 bytes
SHA-256: 7fcfab9bab418abd01f3ee664c5e2397f30b7359aa44d75aa2caae92d04454b7

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