Malicious PDF — malware analysis report

Static analysis result for SHA-256 540678f3cb929083…

MALICIOUS

PDF

85.4 KB Created: 2021-03-23 00:32:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 2f6a8b482657a1138465192643a49336 SHA-1: 1ef03ff8a25fff4902b731530f3b8edad07adff9 SHA-256: 540678f3cb929083e3ac1f828c532faad753814b661fba9da91155b984b625e6
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The embedded content, though heavily obfuscated, appears to be related to search engine optimization and potentially phishing lures, indicated by the URL containing 'award'. No scripts were extracted, but the PDF structure and numerous external links are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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.
  • 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://seumenha.ru/award?keyword=english+meaning+for+tamil+words+pdf PDF link annotation
    • http://getporte.xyz/12819414274ijv2p.pdfIn PDF document text
    • https://cdn.sqhk.co/duzoxibuf/dr9yjjd/peduxekosowujis.pdfIn PDF document text
    • https://cdn.sqhk.co/teruzemoru/gjbhhih/castellan_fisicoquimica_2da_edicion.pdfIn PDF document text
    • https://cdn.sqhk.co/vefomatakin/ieji6ja/pofawagilutavipem.pdfIn PDF document text
    • http://workbykoder.xyz/jewoneash4l.pdfIn PDF document text
    • https://cdn.sqhk.co/karewura/iagj6he/wibujuvitozabi.pdfIn PDF document text
    • http://afracheat4.xyz/59888739478nix7e.pdfIn PDF document text
    • http://bighome.space/multi_step_equations_word_problems_create_a_riddle_activityt3h37.pdfIn PDF document text
    • https://cdn.sqhk.co/nogugojuri/jfxijUc/gajularojizun.pdfIn PDF document text
    • https://cdn.sqhk.co/pogezasamu/qFijZja/pixel_hunter_vita.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/5T3czal/kitupalurosigo.pdfIn PDF document text
    • http://picply.ru/tinebizemizizokafokiwx0i.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://83d12552-0bc1-4415-b221-1da25caacb9b.filesusr.com/ugd/1e11d0_0bf413d687f94ab2a3176995efc54332.pdf?index=trueIn PDF document text
    • https://044ec7df-721b-4788-b209-87474a3fcb06.filesusr.com/ugd/60ffa2_54aa71b46c034f85a73de6fac64b3f1e.pdf?index=trueIn PDF document text
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_4ca85172c6e246fa91eb904778c5de3f.pdf?index=trueIn PDF document text
    • http://zebikijixikemas.rf.gd/vevuxorenewatixegegulex.pdfIn PDF document text
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_50591390f5d64d00bd9c9821a3565478.pdf?index=trueIn PDF document text
    • https://033a7475-7ccb-45c1-8f1e-38fd320d48d0.filesusr.com/ugd/03a576_971912b60a4846f580d7fddf4b3ed382.pdf?index=trueIn PDF document text
    • http://nivosifif.rf.gd/poster_illustrator_template_design.pdfIn PDF document text
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_2eb3fb3d8f8c42909394a30745e513f3.pdf?index=trueIn PDF document text
    • https://b5d51143-f34a-4a4f-9265-6917490cb775.filesusr.com/ugd/9f69bd_f7ce9d9e8a954e179dbbb905f2aa9f64.pdf?index=trueIn PDF document text
    • http://palowok.epizy.com/excel_vba_set_variable_as_worksheet.pdfIn PDF document text
    • https://562a32fb-e9c8-4d8f-ac7e-a760da58c396.filesusr.com/ugd/68ec97_53b45e077f9e456ab49cc702ab3b7ea7.pdf?index=trueIn PDF document text
    • http://diwokisames.rf.gd/25913876969.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10157 5292 bytes
SHA-256: 9415c0e9a72335d59a5367b3ad8ed55530dd8edc27ce46fa2506bcef877c5264
font_01_sfnt_off00011337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11337 11384 bytes
SHA-256: b98b5427d7b2afc2d1396dd1f3bd06766068b6eda8d49c6dfc5b3f2756bef247
font_02_sfnt_off00013996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13996 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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