Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ae0bd0a0c45f619…

MALICIOUS

PDF

77.5 KB Created: 2021-09-08 23:20:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c83d272b3334a5f32df45b8fa09ad9a7 SHA-1: f030355e8fa85bba87ec0622ca03ddfdf5432d47 SHA-256: 7ae0bd0a0c45f61915d05c59a2165544dbf60981cd556d0b8d48fe6f88d9d897
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies this pattern. While no scripts were extracted, the presence of many external URIs suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=harry+potter+3+full+movie+123movies PDF link annotation
    • https://megashina24.ru/files/files/wavobobodinijib.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/fifurax.pdfIn PDF document text
    • https://techlan.pl/files/file/vegizarinikoxigo.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/vigewopare.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/lanawovobezorududilaxav.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/xidomibalujupoworeme.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/92532683336.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/81143954709.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/89393625500.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/27161750182.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/38441804254.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/xubenotofanop.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/98849547880.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/kejovezamaza.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613179497fdfc---tefegokeburaxoro.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/fq4rgr8cisg1brdeqquairdlor/zipusubek.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/barosaruranisipanoruzon.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/sakij.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/xexuvixotajufi.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210903_FF131C6AAF84172C.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/84272030705.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/9954408319.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_off0000c6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FC 18496 bytes
SHA-256: ef265797f425d6ee62190521bc089b809ec4b6e960416f7d15b705e226936d93
font_01_sfnt_off0000f680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF680 11032 bytes
SHA-256: b5e9810d2feeac0aac24d6868701869a56774e1efcbd8ca2b902099f6e446344
font_02_sfnt_off00011052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11052 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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