Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa629fb262be357f…

MALICIOUS

PDF

80.4 KB Created: 2021-10-10 11:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9e28f39dc52c5410d95a41d23b58d572 SHA-1: 3e5ded3b547d8cc4ba66a731925b9b01033e57be SHA-256: fa629fb262be357fe91482f37f794d92cf37e1a76aad8aee1eae53718fc782e4
166 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_CLICKFIX' heuristic suggests the document is designed to trick users into executing commands, a common social engineering tactic. Multiple URLs were extracted, with one identified as a link farm on disposable hosting, pointing towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://sbstroy53.ru/img/files/41315424720.pdf In PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/ledafifafejedis.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/rokobopaxa.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/51757127926.pdfIn PDF document text
    • https://lrdreamteam.com/files/files/file/InfoProduct/file/bamebon.pdfIn PDF document text
    • http://www.sunriseacademy.in/ckfinder/userfiles/files/36646954931.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/86282042950.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/96582132469.pdfIn PDF document text
    • http://sbcnepal.com/images/file/nivutil.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/narogazajix.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/65675288490.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/7a9c4f56ce91ca1caf79127a870dedeb/7053319713.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/65811335219.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/36402170255.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/29476482828.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/4446697493.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/tevixezu.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210916040508.pdfIn PDF document text
    • http://araratmebel.ru/img/file/34550846849.pdfIn PDF document text
    • http://julianina.de/upload/file/buvazefuratepegapapute.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/16690460730.pdfIn PDF document text
    • http://kant21.com/userData/board/file/88795163319.pdfIn PDF document text
    • http://topoint.net/userfiles/fckFile/20210929103714.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/zovar.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/9932951793.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/vitumupipazabetekevo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+can+you+recover+unsaved+word+documentsPDF 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_off0000d3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D5 10748 bytes
SHA-256: 8b655d020c36d40e209adb874312d8b38e41b492e5253b3184019ecd627bf1ef
font_01_sfnt_off0000ec9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9E 18400 bytes
SHA-256: 2a6261fae1b2121cc9895b6c4e76696c4de42ff7b05ea502a9cff4fa67714088
font_02_sfnt_off00011bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1