Malicious PDF — malware analysis report

Static analysis result for SHA-256 db764c309788a28b…

MALICIOUS

PDF

84.9 KB Created: 2021-09-21 20:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7f714baded628429bccd77765c2a86f8 SHA-1: e825d84119e10b7822b648cf6d4abea29ccac831 SHA-256: db764c309788a28b922bd8b1786b278e17ca5f3c4f0ebb20814f33b682270c29
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for distributing malware or conducting phishing campaigns. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://3wsystems.com/shipinc/userfiles/files/33226407997.pdf In PDF document text
    • http://opersan.com/file/ruforawefemumowo.pdfIn PDF document text
    • https://superchills.com/userfiles/file/46425869196.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613511412b95e---75429908048.pdfIn PDF document text
    • http://biomehl.com/images/content/files/dagonelozasalojox.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/45614533467.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/wibadomowuduruku.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/xemematiwigimo.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/sifixivalelogatubofexi.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/28587847747.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/95083870384.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/23762273782.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/69467042880.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/46065921724.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/nisepunepovizepe.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/zomudokaragetogawujujuw.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/34268310855.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/32314650609.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/majabosusurezigizemafutix.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/16423280171.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/xezaxoxonupajupitupazaxun.pdfIn PDF document text
    • http://www.lalorraineperdue.com/documents/9230037298.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/23689683516.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/korigegovatowo.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/49583921006.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/rebopuxutevedikowidedorog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=xenoblade+chronicles+2+do+you+need+to+play+the+first+onePDF 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_off0000e40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40F 11196 bytes
SHA-256: 7255a519d96c4eae2dc56e0144b25f7af00cfe14c106dc1468468475221f1dd8
font_01_sfnt_off0000fe0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001161f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161F 18088 bytes
SHA-256: b2f6f98a053b0e11945fdb70b5a515b44e9ac1ab126ca6650354ad2eb27ac21b