Malicious PDF — malware analysis report

Static analysis result for SHA-256 583c344f579e3357…

MALICIOUS

PDF

101.1 KB Created: 2021-09-17 05:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b2e23bde74262e61e733f3ce068985d8 SHA-1: b02de22e4f5a008f70ba8ba50f5023cd7dbb6876 SHA-256: 583c344f579e3357d2d0cc070d3140f44023110f953b41fd770bc0f2241b0e9c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm or SEO poisoning attempt. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9767

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://aksukartela.com/images_upload/files/fenijudugaserewokilebenap.pdf
    • http://kredoteka.ru/uploads/file/71038398991.pdf
    • http://movesearchesuk.com/userfiles/file/pidaninugasi.pdf
    • http://yuhao-tech.com/userfiles/file/19143786247.pdf
    • http://loveperfectionschool.com/upload/file/vofesuxupasuna.pdf
    • http://innotec-industrie.be/userfiles/file/82013289744.pdf
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/63165826484.pdf
    • http://zsdbiopharm.com/upload/files/68294454101.pdf
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/rugadijidebovikopep.pdf
    • https://madspot.dk/ckfinder/userfiles/files/wugutekeginubizofafoguv.pdf
    • https://eastmangroup.org/ckfinder/userfiles/files/favamasoxiwosuruzerow.pdf
    • http://akcompany.vn/uploads/userfiles/file/28931476382.pdf
    • http://magiepourenfants.com/images/mediamanager/file/48726768274.pdf
    • https://serka.com/serka/upload/files/53681756507.pdf
    • https://daqing-jewelry.com/uploads/files/202109121928505545.pdf
    • http://avision-italia.com/userfiles/files/32605676501.pdf
    • https://shevtsov-art.com/uploads/files/sososokir.pdf
    • http://bivalyracing.hu/files/file/90603433781.pdf
    • http://myxroad.net/upload/userfiles/file///84453019531.pdf
    • http://driver-jazda.pl/upload/file/gewapemetobobi.pdf
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xasibe.pdf
    • http://sport-zavora.cz/data/file/lajufisulajibokamowoxipe.pdf
    • http://reguitti-engineering.it/userfiles/files/vebadetekepuminutu.pdf
    • http://pathtojanna.com/userfiles/files/15020272286.pdf
    • http://nusratali.com/userfiles/files/ropatupanumexemudoxus.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=one+ui+3+android+10
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2e7.bin
eb0b436cfdb61c6d08fa4ada6806a5b244b2c152307418e88f5e7bd35b931499		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E7 10400 bytes
font_01_sfnt_off00010a91.bin
1adceffa14c2d6d90f433d0648fecb436f4a4b3074729951f8a0f50e33d2c8b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A91 26248 bytes
font_02_sfnt_off00014c95.bin
babda040cc94e7e270d7d36b0478b612ad37ee4937396cfd3c0704221bb925f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C95 16552 bytes
font_03_sfnt_off000163e1.bin
6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x163E1 1680 bytes
font_04_sfnt_off00016bdd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16BDD 16792 bytes

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