Malicious PDF — malware analysis report

Static analysis result for SHA-256 c28f4e4e15d3adaa…

MALICIOUS

PDF

85.0 KB Created: 2021-09-17 16:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d337a041731cc4604beb83b56a595fa3 SHA-1: 61bda38ff98967aada10a2e73149954d33232ce5 SHA-256: c28f4e4e15d3adaa12c2918c97ac27d0cf95ea044071241e3ac774f678e93b23
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged 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 presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://coretry.ru/uplcv?utm_term=roms+for+drastic+android PDF link annotation
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/magugavadipil.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/3405503165.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/laborejan.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/89517649949.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021090903471173499.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/zulazozazaba.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/nirunawimi.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/gelowategatawitomipu.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/rituxapeboxavelokojilifiv.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/rezis.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/sixetuvemiziwakikunut.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210905_105635_126.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/60262907312.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/somiposatenosimasowu.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/98489685681.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/tipuvi.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/32265286481.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/64320077723.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/85635783477.pdfIn PDF document text
    • http://patroha.hu/file/kematugobegasoxe.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/98559983468.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/gijadebubiluxalagajo.pdfIn PDF document text
    • https://trieurodata.ro/images/file/77511370766.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/14797135206.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/vusotiguxepepufakiko.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/zibemositasa.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_off0000e50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1E 19072 bytes
SHA-256: 6837baf7d67c1f0dcf71252c6904f10b27b84ffc1663835e3541b6bf59036718
font_02_sfnt_off00012eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EEB 10504 bytes
SHA-256: 392f1e775b51140580ef8bb4ea8368b67035bf0d359da132c2c0e6083f250ce1

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