Malicious PDF — malware analysis report

Static analysis result for SHA-256 3786715ea586ec93…

MALICIOUS

PDF

85.2 KB Created: 2021-05-29 05:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ec4c260f31d725e0bd93a3a9ec959212 SHA-1: b88d3ad40722adaf1aed01f676480d328d1263e8 SHA-256: 3786715ea586ec930e2b17d3b12994227562322c1f13b5f9df8488d9aaf736f0
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified the file as malicious, specifically as a phishing or trojan PDF. While no scripts were extracted, the presence of numerous external links suggests a potential for directing users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/123?utm_term=pubg+awm+sniper+sound PDF link annotation
    • https://zadoloxo.weebly.com/uploads/1/3/4/6/134602956/715577.pdfIn PDF document text
    • https://getawupib.weebly.com/uploads/1/3/1/8/131856556/juxunutu.pdfIn PDF document text
    • https://duxoberadu.weebly.com/uploads/1/3/4/7/134718286/malafi_salisasiwodeza_jexot.pdfIn PDF document text
    • https://jinezosibe.weebly.com/uploads/1/3/4/4/134454760/4664167.pdfIn PDF document text
    • https://vasefifux.weebly.com/uploads/1/3/1/3/131382239/majozipozem_gukimapeluborab_goteb_bipebuduj.pdfIn PDF document text
    • https://gebifafotuzuwi.weebly.com/uploads/1/3/5/3/135324040/5b57fcc.pdfIn PDF document text
    • https://sadozilodefizon.weebly.com/uploads/1/3/4/6/134659806/7560242.pdfIn PDF document text
    • https://vojimefijizudi.weebly.com/uploads/1/3/4/3/134310580/zemirapitukusebaw.pdfIn PDF document text
    • https://ruwiderok.weebly.com/uploads/1/3/4/8/134891429/zedojewoleve.pdfIn PDF document text
    • https://puroporutenes.weebly.com/uploads/1/3/1/6/131606954/7035045.pdfIn PDF document text
    • https://bikigevoxepasi.weebly.com/uploads/1/3/4/7/134716722/zutinoxosexuwu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102HussainIn PDF document text
    • http://smc.org.inhttp://smc.org.inIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/48813037-a5db-4942-ae76-965282d35d1d/baruzaxaladigotagaginudo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc8a8ff1-cf59-4d45-8cc4-fb678489a3c5/tarurupepufafawi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0af0064-2630-4370-bd92-f126917692f0/panomelagolatuteneginuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f0570b0-acd0-4773-adce-6a4767ad5cb5/how_to_secure_chain_link_fence_to_ground.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/512701b8-c904-46cf-998a-ba22f3ae4c24/alex_rider_movie_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86dbdc9b-adfb-46e8-9619-5f9d72e03525/gamamun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11d8882a-e95b-4683-8448-2afc91b5b30a/matlab_electrical_circuit_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c34b4e3-6344-4dda-91c1-c00e2399c4aa/35125331609.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcbbc8f9-d361-49ee-a7cc-bd7e8d020dee/the_secrets_of_the_immortal_nicholas_flamel_movie_release_date.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
    • https://gitlab.com/smc/meera/blob/master/COPYINGIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08E 5280 bytes
SHA-256: 771259237287f9b3e17fea2cd26fbfe1e04874b9a1a95b8d17dbb241b926e8ab
font_01_sfnt_off0000f258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF258 2740 bytes
SHA-256: 676e0c788120a2ce4abc091f157f4df7886573cdaecd57922d98e75f8370c077
font_02_sfnt_off0000fd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD39 10984 bytes
SHA-256: 751747470bcfce7be323a8e1e709363cea9b48a6918efd1ffba8481714569af1
font_03_sfnt_off000122ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EC 16384 bytes
SHA-256: 226a8e4e528c820945b068501793868e9b71e899c703a7ad804f9a2f424011a5
font_04_sfnt_off000138b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B5 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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