Malicious PDF — malware analysis report

Static analysis result for SHA-256 94aba58daa9b0cf0…

MALICIOUS

PDF

70.8 KB Created: 2021-09-21 17:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5899c79b21b5aae1cbbfb5fcac890dee SHA-1: 293d5490a9dc1f0d82643f3903188321139660d6 SHA-256: 94aba58daa9b0cf04493626fd0e2000b5c800296773b6511a644d3f706215b66
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful websites. The PDF structure and embedded URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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 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://crewmak.ru/uplcv?utm_term=android+studio+send+image+to+server PDF link annotation
    • https://proetcontra.hu/userfiles/file/68431973890.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/rekojewubidisogukur.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/13281115878.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/suworotabasafo.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/22281315196.pdfIn PDF document text
    • http://wawa757.com/uploads/files/33981809854.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/9453273165.pdfIn PDF document text
    • http://373113.linker.tw/files/11045921210.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/5985627941.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/vezovafejifik.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/wanonob.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/66917089650.pdfIn PDF document text
    • https://ambalatender.com/upload/files/12192222390.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/74206575529.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/gitogotenixosox.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413cfce5325---nilulidefovidesenax.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/wefulijobolobenu.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/64065408044.pdfIn PDF document text
    • https://onecre.com/images/content/files/zepun.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/94510803914.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef12f1428f---jikufadutefof.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/pebosiwivesu.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/vavaxamij.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/34171086664.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB674 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE86 15056 bytes
SHA-256: 031afbe95f3e3ad509d19a496cc65e2670212401387d499b663eb3f13ba12653
font_02_sfnt_off0000f4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B2 10692 bytes
SHA-256: 0a95997ae63c8772c2cc15a50490a61b846606e6be2a13bb07dc9c6a16a78193

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