Malicious PDF — malware analysis report

Static analysis result for SHA-256 aba8c8be39cab298…

MALICIOUS

PDF

69.6 KB Created: 2021-09-10 21:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8ad0afdf382bb5c3a1d6e3b684eaf55d SHA-1: 67e813f32722e1b20ed1f1144c9fd6b8ac76a4f6 SHA-256: aba8c8be39cab298b59c54be198230853dbd5c37598682e5c19f99818a1457d4
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with a high heuristic flagging it as a link farm on disposable hosting. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the structure and URL distribution suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 4

  • 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://wingmanresearch.com/userfiles/files/14959542227.pdf In PDF document text
    • https://weilmclainboiler.ca/fck_upload/file/17202026892.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/81544797192.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/16455009286.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/suvezodezugedol.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/nujibanurexavovoduzo.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/70452033333.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/pekirudikasenoxexelidasof.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/metijuwixopadozaka.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/94504296038.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386efb9d858---rilefoxires.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/92643714337.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/fajusozotomusig.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/refilipamadideseroxa.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/69520333427.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/16789518257.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/fukeli.pdfIn PDF document text
    • http://lepal.sk/ckfinder/userfiles/files/85459280982.pdfIn PDF document text
    • http://htbestcomputer.com/media/ftp/file/32578732044.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/kuvalamenafedezi.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/11002199082.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/83413710025.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/29850102357.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/kuzekobake.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/51524460494.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=io+meaning+gamesPDF 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_off0000b3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE6 15116 bytes
SHA-256: 0e411dc1d95f186899d80a65d5c80aa6bfa1d20cedc2eca2a5cfae29e0b3bff1
font_02_sfnt_off0000f22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22C 10156 bytes
SHA-256: 14cb65ec03391b4c500b7054d87a33d1580a17b2504424af347a6a6f58baf09c

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