Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d8718fbb7a0f848…

MALICIOUS

PDF

82.4 KB Created: 2021-09-10 18:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 22ff1a69be0f1c839b2acd6971806052 SHA-1: ea29140f554eaad814b6fbd2bdb36fba9c5ead7e SHA-256: 1d8718fbb7a0f848e3cecd5b5ea56648769401644a149587333a0bd412b79829
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to PDF files on various domains, suggesting a link farm designed to redirect users to potentially malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern, indicating a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://pixomot.ru/uplcv?utm_term=android+21+and+goku+black PDF link annotation
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/13021098404.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/pewexitujobimam.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/xifomuzipekij.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210904061031.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109081434071083.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/zoxezibolad.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/97152341484.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/lezunozogonekesezevekol.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/858344086.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/lireboran.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/niwenukim.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/pefusofevenil.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/zefal.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/26367461574.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/zowazukeg.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/vafufavisolisalu.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/13632151943.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/46097073119.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/18296695890.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/wimitijuwojiteda.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/pubekewawebawiwafix.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/37068680373.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134f15c2382a---27639314687.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/34453076385.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/8077290143.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/gumapufuluxabiped.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_off0000ddde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDE 17620 bytes
SHA-256: 1a2a7b5ac820a061e86d8bce1755690b248870fc21b27ad1da7783e372fd0681
font_01_sfnt_off00010bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E8 10632 bytes
SHA-256: 0ff3a9ed185695194fb6649b0bd3f9aa4be16e10022b99ecaf30d084a9fa28b0