Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1570976d37fe086…

MALICIOUS

PDF

82.0 KB Created: 2021-09-19 03:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8c428fc2026cc243fe7fadc16105c26d SHA-1: 41c16e8840d3637a87e968cfa8a69059f508be54 SHA-256: d1570976d37fe0867d38ec558836fe18e91f4982cd7fae2210a2e426336411bc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains, and exhibits characteristics of a link farm designed to redirect users. The presence of a URL with 'among us free download' suggests a lure to attract victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://www.psyforyou.nl/upload/fckeditor/file/jixazaretisofav.pdf In PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/rofiweso.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/7510674707.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/lemirej.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/37552048004.pdfIn PDF document text
    • http://erpos.sk/data/files/vizovaperujuvutujolikopeb.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/6779901577.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/nefomixurug.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/28595638721.pdfIn PDF document text
    • http://gerocuki.hu/user/file/lunovekikaro.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/vodumam.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/90266828023.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/ditolug.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/53499499322.pdfIn PDF document text
    • https://davnosti.ru/upload/73577828513.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/5382015347.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/zitudibupefojuvu.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/nejolokitefujixamuge.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bemexasupegabuviv.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/56120091162.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/barazovesel.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/48531815323.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=among+us+free+download+pc+2020+latest+versionPDF 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_off0000d6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBF 11436 bytes
SHA-256: fc14b0bd234be1a851032032d903ea7c264b3cf0fee13232e075a87ce3f15e59
font_02_sfnt_off000109ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AE 18772 bytes
SHA-256: 4f84ca20701b91acd5466599b09e85f4a69812753fdc9972780c2d5def2a8ce7

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