Malicious PDF — malware analysis report

Static analysis result for SHA-256 75759faf10324419…

MALICIOUS

PDF

86.6 KB Created: 2021-02-27 03:28:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad4264e501e1cf47109c4433225841ed SHA-1: 83b684b7cd0c9be5619d3fd340e14e64207558bb SHA-256: 75759faf10324419aa89d8b71cc775f728c4fb637b5ee5a4e5bcb50ca708382e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant portion hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

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://fokemale.ru/123?utm_term=can+sunsetter+awnings+be+roof+mounted
    • http://sezidagajajam.iblogger.org/81049970027.pdf
    • http://lulopoboxefon.scienceontheweb.net/pokaseduxafubarapawa.pdf
    • http://wotevolodux.iblogger.org/ge_4-device_universal_remote_control_manual.pdf
    • http://gojawufeki.getenjoyment.net/what_is_tqm_and_why_is_it_important.pdf
    • http://ponopawux.iblogger.org/carpenters_superstar_sheet_music.pdf
    • http://digosige.mywebcommunity.org/munatunetejipoxared.pdf
    • http://bataxabinon.22web.org/apple_inc_company_profile.pdf
    • http://xudogiborijum.66ghz.com/tu_delft_campus_map.pdf
    • http://gisoboxizaza.mygamesonline.org/de_que_ao_se_puede_legalizar_un_auto.pdf
    • http://palikexifumalam.mywebcommunity.org/44473598343.pdf
    • http://zememor.sportsontheweb.net/dell_optiplex_760_upgrade_cpu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bogalibamadom.myartsonline.com/wuwawamavuxabe.pdf
    • http://xulelaperimiku.epizy.com/mitifu.pdf
    • http://popofisofol.myartsonline.com/how_to_find_the_interior_angle_measure_of_a_regular_polygon.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011449.bin
c5caa4fd84a68d926a85430d4d38a094adec15fe84b28d46ed6cb05da4f2803b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11449 5332 bytes
font_01_sfnt_off00012660.bin
f79433f223b2dd27c8f3d3b2c1146641653cb7376614441222b5d10b82b11eb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12660 11512 bytes

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