Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb6509ad0399e447…

MALICIOUS

PDF

113.2 KB Created: 2021-09-18 14:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dcda20d2c643c2a09f2759d86c42569f SHA-1: b37c08327aeb3cd657bd09a41fe63611311d9d56 SHA-256: fb6509ad0399e4473749082a5b81253d7af72971e17f0448ed79ab1e08c24a26
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains numerous embedded URLs and is flagged by heuristics as a link farm and a potential phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and the 'callback phishing phone lure' heuristic suggest the document is designed to trick users into visiting malicious sites or engaging with fraudulent services.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://garglob.ru/uplcv?utm_term=epic+of+gilgamesh+pdf+free+download PDF link annotation
    • http://tythb.com/uploadfile/files/40190806312.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/79392606474.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/galufun.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/gexoves.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/31303260272.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/77534798349.pdfIn PDF document text
    • https://nevisnews.com/userfiles/72376720154.pdfIn PDF document text
    • https://agatanorek.com/files/file/77346312131.pdfIn PDF document text
    • http://brain-sh.tw/upload/file/18694009204.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/85612284293.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/gekogolapenekuf.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614048b58d8e0---gulagozer.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/16314603564.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/77862044591.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/medusewelawaw.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/8389431238.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/96184195959.pdfIn PDF document text
    • http://anm-av.de/uploads/files/kejivavababikevanuve.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/tujugodanixolurakevumijuk.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/28912144993.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/36325214418.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/kudas.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/jumavuzubesurolaruza.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/nexuwejopeponozapigi.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_off00015604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15604 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E16 18156 bytes
SHA-256: e83eb9fc066e6a70e3abbe1d33310b0028abd9af35e3edc84ba217d9a13c50cc
font_02_sfnt_off00019d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D7A 11036 bytes
SHA-256: 351b2da6d9a2e19767dce668289124ed2db654b3f53164bb6ae1b19ffe317d9a