Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab3d3f4fe1cec654…

MALICIOUS

PDF

81.0 KB Created: 2021-09-21 00:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f4bb2c2dd58211d29b9fef01ff2d3d89 SHA-1: d7313a24670102fbd2dd520420252ff67e9b59b9 SHA-256: ab3d3f4fe1cec654fde82c06db1f90eb548144c5473d0e2a4d94bfff58cd1ade
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous embedded URLs pointing to various domains, suggesting a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, reinforcing the malicious intent. No scripts were extracted, but the presence of many external links is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://queure.ru/uplcv?utm_term=ittefaq+full+hd+movie PDF link annotation
    • http://kbfrutos.sk/images/_file/gavimopotifumuset.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140bc1928dc1---pajat.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/1439312315.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/mevuda.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/felamivudadikenegekog.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/73473789298.pdfIn PDF document text
    • https://binhvi.com/upload/files/34471792300.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/15484170356.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/sibojifakoto.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/96773181958.pdfIn PDF document text
    • https://nada70.org/userfiles/file/37732770919.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/3093167449.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/fokofesibanimizude.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/36127702101.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/13650434936.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/31494331022.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210919_6B9E516A3949C9DF.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/dizesenon.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/14354252985.pdfIn PDF document text
    • https://mkontakt.com/dat/file/wawokexogadi.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/1549556868.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/10114950978.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210907_182945.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_off0000da7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF291 17404 bytes
SHA-256: b69517a571f352d1013934e3be9c2cb13047c73a4629646359dfda4712a4f54d
font_02_sfnt_off00011f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2B 10512 bytes
SHA-256: 22e00df3e49d51d858cef5778ca9a4548b575a81766f086ff615e92e3a134fcb

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