Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea3436bdce39ccf9…

MALICIOUS

PDF

72.3 KB Created: 2021-03-02 06:46:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b8b93be2e0ea92dcb7db57ae5088f7d9 SHA-1: b6be0eafcda3320963497acd2f9dbd48249460a1 SHA-256: ea3436bdce39ccf9e20a5fe6a7ea14966a44af23b2bac35f3118afa56413dda3
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically appearing to be a lure related to clothing donation. Heuristics indicate the PDF is a link farm on disposable hosting, and ML classifiers and ClamAV strongly flag it as malicious. The presence of embedded URLs suggests an attempt to redirect the user to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://xezojetit.ru/123?utm_term=where+can+i+drop+off+unwanted+clothing PDF link annotation
    • http://lazotub.mywebcommunity.org/what_is_effective_communication_in_nursing.pdfIn PDF document text
    • https://cdn.sqhk.co/fisoxinizo/jghiifH/409874756.pdfIn PDF document text
    • http://muliruno.22web.org/how_to_calibrate_oven_thermostat.pdfIn PDF document text
    • https://cdn.sqhk.co/xizubulizexe/d7hhcBI/map_my_walk_app_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/dojopaxitovi/bjcshfO/fishing_online_reviews.pdfIn PDF document text
    • http://gamukanemafutu.mywebcommunity.org/how_does_migration_and_cultural_diffusion_work_together.pdfIn PDF document text
    • https://cdn.sqhk.co/zanemulazif/jc1xhwC/2554569523.pdfIn PDF document text
    • http://kazimibi.getenjoyment.net/the_chronicles_of_narnia_the_lion_the_witch_and_the_wardrobe_cast_bbc.pdfIn PDF document text
    • http://vofufime.mypressonline.com/25917030113.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://warufadul.rf.gd/miwufufepegugipisav.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/biology_notes_class_12.pdfIn PDF document text
    • http://fulawumobolofog.epizy.com/barcode_print_format.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/pressure_ulcer_staging_guide_pictures.pdfIn PDF document text
    • http://duvewukabiwetu.epizy.com/18112253373.pdfIn PDF document text
    • https://s3.amazonaws.com/dozuga/decryptonite_v7._0_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/wisadawamizigipo.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/jujapeluven.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_off0000dce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE2 5344 bytes
SHA-256: ed562375260a8f5c8b9b47bdd3d5283cbec845bb65257ae0c1da37bcf990bae4
font_01_sfnt_off0000ef2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2E 10880 bytes
SHA-256: 41a4a779fde32af59a3dceb91d8775abe40957c7d56ccd61de29980ab1b0b4a1

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