Malicious PDF — malware analysis report

Static analysis result for SHA-256 075621466239141f…

MALICIOUS

PDF

87.0 KB Created: 2021-09-09 12:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 193015eb2bca1b498b5bf77aed1346d1 SHA-1: 960b0bb51a81a97e61e6b17d37d1d721ae8c8b46 SHA-256: 075621466239141f215c54049ae0e877a5b4bcf62839e4b209edbbc15a77d84f
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with a high-confidence heuristic identifying it as a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the PDF and its embedded URLs suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://nomylo.ru/uplcv?utm_term=camera+360+pro+apk PDF link annotation
    • https://kalyna.ua/sites/default/files/userfiles/file/1512497523.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/govomarunupuzolo.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/popatuzikifez.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/8924514008.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/23754943916.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/togeziwu.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/66385830351.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/8688407969.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/31303843227.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/kajufudagulekonipoj.pdfIn PDF document text
    • http://yongqingtech.com/d/files/kesunuzikumiravojazekiv.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/zujogovutekapijuxufili.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/18807107416.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/xixuwisuvenozuzureka.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/bawufisumajazuz.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/tugaxut.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/94919054967.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/1092083101.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/bulinakepikakasotiware.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/gomazikexepi.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/14293665659.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/81417700401.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/30837623516.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD170 10488 bytes
SHA-256: 4b94f7ba90b3dc0b656820aef3f3f463da924aba6b218f02fb9256dba30ebfe7
font_01_sfnt_off0000e94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001015e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015E 21252 bytes
SHA-256: d2f2b772e6a3eac3ddd73918f383b089f3035c95c28fe58174d38a4106f5d8ea
font_03_sfnt_off00013831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13831 16324 bytes
SHA-256: 01e690a8a7ee3565d68caabd4b990b388eec542b0b3ee3ae169ee03a16755d99