Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3dfca9feb0a9928…

MALICIOUS

PDF

83.1 KB Created: 2021-03-19 19:07:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9e172a7feaf3a23a6de38b8a45281c1f SHA-1: 10f5a71a037166b2e93304f7f20f73aaa4d0d86e SHA-256: f3dfca9feb0a9928156296931db6891c78e458d30e40b1841487df3fd2a975bc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://druttle.ru/strik?utm_term=software+developer+engineer+in+test+salary PDF link annotation
    • http://fibiver.mygamesonline.org/the_river_radio_station_front_royal_va.pdfIn PDF document text
    • http://jawazapefaxuzit.mywebcommunity.org/brother_tn_630_drum_light.pdfIn PDF document text
    • http://pesoxigesu.iblogger.org/how_to_program_your_craftsman_garage_door_opener_remote.pdfIn PDF document text
    • http://wujejejifi.mygamesonline.org/lizanubetikege.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381788/normal_5fe8a12e41adf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416930/normal_6007d7048256a.pdfIn PDF document text
    • http://vumajuzatijerak.getenjoyment.net/78822639590.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450746/normal_6041c333bd111.pdfIn PDF document text
    • http://bebosebe.66ghz.com/simon_sinek_videos.pdfIn PDF document text
    • http://nenavukatebofaf.22web.org/numepedel.pdfIn PDF document text
    • http://xupevagadozojad.22web.org/jolly_phonics_grammar_1_pupil_book_free_download.pdfIn PDF document text
    • http://xulubapatoso.scienceontheweb.net/how_to_make_professional_looking_tables_in_word.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375355/normal_6002e68173572.pdfIn PDF document text
    • http://dosijefa.mypressonline.com/percy_jackson_titans_curse_movie_watch_online.pdfIn PDF document text
    • http://damewumesigalut.medianewsonline.com/mandatory_safety_signs.pdfIn PDF document text
    • http://kejoxemubogese.mywebcommunity.org/dovavadi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xowuxojugo.rf.gd/harry_potter_8_film_collection_4k_uhd.pdfIn PDF document text
    • https://92ddf5cc-4ce7-4caf-b117-8241c553a727.filesusr.com/ugd/42bae0_9b0a98cf083b4e789ac4c138e133926f.pdf?index=trueIn PDF document text
    • http://jovured.rf.gd/zofarudu.pdfIn PDF document text
    • https://6c8ebe11-725c-420b-823a-68bc39d02ad2.filesusr.com/ugd/3e87bf_7488c06635f445dcb9670e652bf51593.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_off00010a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4E 5564 bytes
SHA-256: 5a89842adceb8f7fff517a40780a61839b951a09037ba1d9d66db9e2f30184e4
font_01_sfnt_off00011d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6E 9988 bytes
SHA-256: 65210bc88b75bdaca3541f9e52f7e66fa100f3ce683098467ad3a12ce6ce6774

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