Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9870291af5e4a7d…

MALICIOUS

PDF

82.5 KB Created: 2021-02-25 22:16:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 95787dafc8d76adb43792f82f45ff9c9 SHA-1: 407d948405d033e5fd05f81a77822e77c1b84ace SHA-256: d9870291af5e4a7d1779a83517c60f9997ec754e6023fb4e32f308ad580670a0
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which are hosted on disposable domains, suggesting a link farm designed to redirect users. The document body, though heavily obfuscated, appears to be a lure related to 'Della robbia ceramics for sale', likely intended to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/wix?keyword=della+robbia+ceramics+for+sale PDF link annotation
    • http://tapozifokun.mywebcommunity.org/how_to_repair_a_snowblower_carburetor.pdfIn PDF document text
    • http://simopuvoramawu.mywebcommunity.org/does_lexus_350_come_in_hybrid.pdfIn PDF document text
    • https://jufoximivovanad.weebly.com/uploads/1/3/4/0/134013024/1036180.pdfIn PDF document text
    • http://gefosezidubajoz.scienceontheweb.net/fikafelifina.pdfIn PDF document text
    • https://notefusiwedamap.weebly.com/uploads/1/3/4/8/134872173/sutut-vekisizojorad-kopaxe-wumazidowal.pdfIn PDF document text
    • http://sowopezamiw.medianewsonline.com/29731157309.pdfIn PDF document text
    • https://titumakusijuvap.weebly.com/uploads/1/3/4/3/134353199/xepujuviref.pdfIn PDF document text
    • http://gejokakop.mygamesonline.org/42535558692.pdfIn PDF document text
    • http://medebupima.sportsontheweb.net/bifebagufefonajirivov.pdfIn PDF document text
    • http://fawikenaxalu.scienceontheweb.net/troy_bilt_edger_tb554_wont_start.pdfIn PDF document text
    • https://kuvukodu.weebly.com/uploads/1/3/1/4/131453249/japuvin.pdfIn PDF document text
    • https://soxapibojewaw.weebly.com/uploads/1/3/5/3/135345372/doparejasikuvukuzow.pdfIn PDF document text
    • http://vekisonoloze.sportsontheweb.net/jepikakuj.pdfIn PDF document text
    • http://jinitevuwug.iblogger.org/41100595843.pdfIn PDF document text
    • https://kokesekodabese.weebly.com/uploads/1/3/4/0/134012443/6120938.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xajumin.epizy.com/75140145111.pdfIn PDF document text
    • http://ziwemasux.myartsonline.com/modal_verbs_worksheets_for_grade_6_with_answers.pdfIn PDF document text
    • http://ziwemasux.myartsonline.com/ap_stylebook_free.pdfIn PDF document text
    • http://ginowane.onlinewebshop.net/samsung_galaxy_note_20_ultra_in_india.pdfIn PDF document text
    • http://tupopozavagaf.rf.gd/douro_valley_travel_guide.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_off000107f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F4 5168 bytes
SHA-256: 654ca9bcca5a04362abb12ead8d02e860c7d6eaef937a692b488ce9a340526d2
font_01_sfnt_off00011977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11977 10360 bytes
SHA-256: 96be7ea003a92bd1b6a194ef6640faf32c187c76020b2c8bee50ccfe08db5ec3

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