Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ad1e5fafe8b61e6…

MALICIOUS

PDF

85.0 KB Created: 2021-09-19 01:31:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e491554d87ccded8617886b513356498 SHA-1: b18d30bfe32534127dfeda12c7fc4a73d189c1bd SHA-256: 6ad1e5fafe8b61e6a728623dec404d390831010a9f96f2a81d9fa57d67d6033b
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, including one to an algorithmically-generated URL, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan. The presence of JavaScript suggests an attempt to execute malicious code or redirect the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=babumoshai+bandookbaaz+full+movie+download+mp4 PDF link annotation
    • https://xebecdesign.com/xebec/userfiles/file/90012705466.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/xibilepibekalamevim.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/vuwunolarodifixale.pdfIn PDF document text
    • https://castel.ro/userfiles/file/23712247026.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/woperenute.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/19443700849.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/1450768000.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-17/20210917040740966486.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/zujikulonovumelokagama.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/11216893984.pdfIn PDF document text
    • http://vecsecity.info/editor_up/sogepekuvajowa.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/kadodatadusowut.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/217742102.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/lusibivonaw.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/34962702194.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/35512196159.pdfIn PDF document text
    • https://tekartltd.com/upload/files/nifelimenujona.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210919_1FD7679D2DD90E7F.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/10866485062.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/namolekesuxugu.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5a985b61d---tevuvutixakevaselete.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f321c506bd---kenenigivixisadaved.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/segamapunexas.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/rafibejuwujulilezizabote.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/beboj.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/dukigewufemejezib.pdfIn PDF document text
    • https://rt9.rspo.org/ckfinder/userfiles/files/76540277564.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_off0000e56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56B 17804 bytes
SHA-256: c9df00fcaa546c4ee62d37350cd455e92e3d4e0cb7f9fc50b9ff2ea1d03cc01e
font_01_sfnt_off000113cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE2 11240 bytes
SHA-256: cf0fcb904c7b34da85dbac4b106e726f068e584a8bb13de6d5e6fdcf5a64553f

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