Malicious PDF — malware analysis report

Static analysis result for SHA-256 17deaeb19af52717…

MALICIOUS

PDF

67.5 KB Created: 2021-09-27 17:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fa7ad07361f8bceb0cb9ab4b151f4023 SHA-1: cc0ac2de3603920ed95faa0baebc503231aa30b6 SHA-256: 17deaeb19af527174a3d8215d551dd14659c11731ee8ed763f24b33d279cbee3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic analysis revealed it functions as a link farm, embedding a large number of URLs, many of which point to potentially malicious or unknown domains. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to phishing or malware-hosting sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://heart-calligraphy.com/uploads/files/202109172219523014.pdf In PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136318753363---lotejepovulolub.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/zuwuvafifixemosixulifexis.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/86216390714.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/86635812460.pdfIn PDF document text
    • http://klinok-saintp.ru/files/96287698324.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/64438332202.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/22117594453.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/winagenuli.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/pudipefefufugikimi.pdfIn PDF document text
    • http://weldingplaza.com/files/file/xivigavosededipodokunezog.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210915_215307.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/vojozurakodero.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/gemuvixozaxurofeg.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/97819509776.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210924131429.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/30759451891.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/29055983298.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/89704210837.pdfIn PDF document text
    • http://logicamail.it/draft/media/penewodaminuturazeromo.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a0526c572---wabenetimajarubip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=best+way+to+download+music+to+androidPDF 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_off0000aa7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC291 14732 bytes
SHA-256: 260ae282ca3b89eacef5b52c0e880907db34f3c50a4b389351648a7f9f839606
font_02_sfnt_off0000e785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE785 10884 bytes
SHA-256: 0b6d0b0aa83ff60f216c4eae1a0f47f58ae2e573a810be0e3df50bd6123cf18e

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