Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6c253b0aa4356dc…

MALICIOUS

PDF

80.1 KB Created: 2021-09-18 10:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9eccd41d43c6d0db52291fe9736c19b4 SHA-1: a896e9f80274f5fa001c5be51e6278193f0ee588 SHA-256: c6c253b0aa4356dcfc7e7bcd0b3f96e81dc319bacdb4e9a9fe4d5e73df9aef02
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external websites, many of which are hosted on disposable domains. The presence of many unknown reputation URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://intersat.lv/files/file/93381165108.pdf In PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/96329357869.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/25254324812.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/woriralegiwevarogoseweme.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/kosezikopagizanovobomugup.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/48867499039.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/dirulugipez.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/mulolonudikirosi.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/ranisifotovot.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/14445100813.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/39618189043.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/50769607877.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/xuxopuxagum.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/wefipetite.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/xifijojo.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/67388959030.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/44369129196.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/timog.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/39379297643.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021091400585273499.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/vipepowemiral.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/kowawo.pdfIn PDF document text
    • https://bnovum.hu/downloads/fofatasetawebumigo.pdfIn PDF document text
    • http://gaudi.tw/upload/file/pajarefizapemerozaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=abc+movies+streamPDF link annotation
    • 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_off0000d625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD625 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE37 17880 bytes
SHA-256: 1533589abbd920374f7a5253273c7d3bb6ec65db6cae7e0fd3cb90f7f591345b
font_02_sfnt_off00011bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCB 10428 bytes
SHA-256: f88bebd4b718a9c2512cf5e890bd79974b7e2dd9721dfc60ee27f6c2d2f2d67e

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