Malicious PDF — malware analysis report

Static analysis result for SHA-256 35b042cf3c3881fe…

MALICIOUS

PDF

79.5 KB Created: 2021-02-17 05:48:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 784694e869d45cf7a361d033ef394def SHA-1: e106a860fecada9ac4cb3815c55d9449b1b7b2a6 SHA-256: 35b042cf3c3881fecf2e80073af1a7b57730c327943b9728f5c6d73cf843f580
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV also flagged this file as malicious. The document body, though heavily obfuscated, appears to be a lure related to academic topics, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=how+to+find+initial+velocity+in+projectile+motion+with+angle+and+distance In PDF document text
    • https://static.s123-cdn-static.com/uploads/4482219/normal_5fe13e3302cec.pdfIn PDF document text
    • http://hookup157.fun/kirby_heroes_in_another_dimension_guidezqpe2.pdfIn PDF document text
    • https://cdn.sqhk.co/kujotukil/iicgeja/83324969095.pdfIn PDF document text
    • https://cdn.sqhk.co/vabalogu/bigiziv/classic_bingo_touchscreen.pdfIn PDF document text
    • http://abistrans.ru/622675508402pzjy.pdfIn PDF document text
    • http://rivuxini.66ghz.com/wumanifofezisisibajofexan.pdfIn PDF document text
    • http://bejozenofidon.22web.org/levejutabibikemi.pdfIn PDF document text
    • http://gelchlen.fun/paulo_coelho_biography_worksheetgtm3v.pdfIn PDF document text
    • http://whitecheat.xyz/gafugjdzv4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453909/normal_601dd45851c5e.pdfIn PDF document text
    • http://afracheat8.xyz/67886459878db16q.pdfIn PDF document text
    • https://cdn.sqhk.co/vawapisoxe/mDBig0E/nowofuvusoniviwozerazeri.pdfIn PDF document text
    • https://cdn.sqhk.co/zogowefu/gGeHhgn/how_to_unwrinkle_paper_tablecloths.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://s3.amazonaws.com/levumoduf/bhopal_gas_tragedy_full_movie.pdfIn PDF document text
    • http://nudenagazosizav.epizy.com/kolifasudukuru.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/xefoduminanunefaxot.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/fubuguximudivamusiwepa.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/bozokojavobijivitusax.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A3 5648 bytes
SHA-256: dee89736a460348ae265853b62c13186fef46d888755b01bf12edd818761b55b
font_01_sfnt_off0000e5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CA 11352 bytes
SHA-256: 39099b9198f2bdb2f15e900d4c92cc4c31995ba998f52cce7419732c2cfbc476
font_02_sfnt_off00010cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDB 16088 bytes
SHA-256: c487aa01613208473e3c0b892de3260687b9c0341624d6c76d95d7849508583e
font_03_sfnt_off00012192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12192 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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