Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c4abaf555033f2…

MALICIOUS

PDF

80.7 KB Created: 2021-09-16 19:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8bcc75e3e46e89bb06d8a7e085690606 SHA-1: fcfbd8917eeceaf1317d4c52ae778e7515897b15 SHA-256: 71c4abaf555033f29285473fda4d452492f0ea6c7753d9d053a19c1c14c28132
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of link farms on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself is also suspicious, with duplicate object bodies.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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://cructi.ru/uplcv?utm_term=android+vs+iphone+debate PDF link annotation
    • http://isspskola.lv/userfiles/files/93412108907.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/jesabasopaje.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133c273285e6---sogokixatugegimagotifes.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/tidonolovoge.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/puparegolizigogagidozinid.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/98251374360.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/munakuwunotebej.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/zoderudori.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210911_71EB8A3064EBBADE.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/80343819763.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/bevakumedakikov.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/rubutujitijexaxawodusoxa.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/fikejilovuxo.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/90615739667.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/nulofenidabojiwo.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/21220083555.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/zujuxamaxinexelokojimanu.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/sezewozosaxazu.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/xivezazi.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/logovogaxuvanowujifanulan.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/36909247573.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_off0000d817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD817 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02E 10632 bytes
SHA-256: 5712cb3bf6b00fb60c4f7393999c6d4ca149aea864c5eac5dd5d81f611437ecc
font_02_sfnt_off00010842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10842 17604 bytes
SHA-256: 0240f1b4133fdd1190654e21dcfa9a25bedb5c6011e06b15d1d08c110b2396b6

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