Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6d85fb1bf2463a5…

MALICIOUS

PDF

73.8 KB Created: 2021-03-22 05:05:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e0e804a1cf162b93528bd9ee4d9455a SHA-1: 97d27d99eda7d1ee454ae9aeb8d6ae4dd2cfdc8f SHA-256: f6d85fb1bf2463a5662e7e3eab00015c4b3fa9addaf232c3e16b954d6121a584
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary external URIs points to 'nipisod.ru', which is likely part of a phishing or malware distribution infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classified as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the structure suggests a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=what+is+the+most+valued+comic+book
    • http://sufawevugut.mywebcommunity.org/11073284493.pdf
    • http://goxadonivibifiw.22web.org/how_to_fail_at_almost_everything_and_still_win_big_goodreads.pdf
    • http://walolexokesufa.sportsontheweb.net/75345229278.pdf
    • http://wofevil.22web.org/29019376413.pdf
    • http://serovakarara.mygamesonline.org/manovizeforofo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c4012088-d633-4e9d-a8ae-be65aa850962/16775275992.pdf
    • https://uploads.strikinglycdn.com/files/454cca5d-b56c-40ca-ba46-24fcae99a6c1/tell_it_slant_meaning.pdf
    • http://xedaxabefax.rf.gd/accounting_balance_sheet_format.pdf
    • http://zisukuvi.atwebpages.com/laws_of_the_game_booklet.pdf
    • https://8dfdba76-182f-4dc4-9dda-37a8c8d09dc9.filesusr.com/ugd/4ae4db_5890bed4df0a4c5bb8c5f2ad6d76df9d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4263b75b-223a-4a93-87c5-53b2b17a7e3f/gozedevofavik.pdf
    • https://uploads.strikinglycdn.com/files/e641213d-3090-4385-93fb-09c736a52a14/breville_crazy_scoops_ice_cream_maker_manual.pdf
    • https://uploads.strikinglycdn.com/files/03a00b2e-d8f2-4abf-b90a-fdd464bcb450/79151369347.pdf
    • https://uploads.strikinglycdn.com/files/6ddbe911-c0ce-4d37-a1b9-fd14d5cb779f/zazodoxixujimepofakoguv.pdf
    • http://risubutiz.rf.gd/vijidefilenizazinikamimov.pdf
    • https://ba30dffa-51fe-4caa-9472-6f142403a9bb.filesusr.com/ugd/c2007e_d70866a8fccb47378f1b5d906b42e5bd.pdf?index=true
    • https://e510c2d5-567e-4a96-89ff-abc18316baf7.filesusr.com/ugd/8a9bcc_0fb1e21c1dcd4a39997a09d54fd2121c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8ebc4594-df6d-4a9f-a7d9-ca1680b2b93b/24381364770.pdf
    • https://uploads.strikinglycdn.com/files/354ef509-23f1-4047-ac08-0262003cc898/descargar_biblia_de_nuestro_pueblo_gratis.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_off0000e35c.bin
86b6af8eac6cc5d9f4a1c8b56e199a99cfec3f3b280176a7da2e7a2c6ad2aac2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE35C 5360 bytes
font_01_sfnt_off0000f582.bin
e5db91c2a39a81e2efae472c4cf7feb33b2c22f629ac51a0021d44397790f760		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF582 10732 bytes

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