Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdecdfcb2e6ca8d8…

MALICIOUS

PDF

69.2 KB Created: 2021-09-29 14:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0be598f6ffb8f0f80ee75078a9b811cc SHA-1: 0562fb345d2684bfe53da59990937bcfce2764e8 SHA-256: cdecdfcb2e6ca8d8452985bbdfe2411a232d4091a42a7bf16d63c5ce98750098
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with heuristics indicating it functions as a link farm on disposable hosting. ML and ClamAV detections confirm its malicious nature, classifying it as a phishing trojan. The presence of external URIs suggests an attempt to redirect users to potentially malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=six+sigma+overview+pdf PDF link annotation
    • http://fajni3333.fun4two.pl/uploads/assets/file/dimobimivufazaful.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/32089519944.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/suwixikejenugolaviwiwod.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/fimajenane.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/jakafuze.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/jomolurevemape.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/bizimupufogexizesabuporif.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/petipenozokikituwoj.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/1958397532.pdfIn PDF document text
    • http://underbutter.cz/download/foto/53101811210.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/kimivaragu.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/39998288357.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/7442646487.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/031967d04b324e601b69bba6a18b165e/74582684756.pdfIn PDF document text
    • https://parkettworld.com/upload/files/ladegekavajikemaximilew.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614cd16b3324b---53037556491.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/99732160535.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/tugadutajuwuxowawajag.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/tosipuj.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/97792376378.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/rarededudojuwefo.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/23092985605.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/88943245656.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/70789077934.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109041842266732.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_off0000b0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CB 10920 bytes
SHA-256: 11f7186a69fb1411f6a1c1e2252bd8659abcd51aea795f2138198d3501e6b696
font_02_sfnt_off0000e1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F0 14904 bytes
SHA-256: d422f1636d2543c847f9e88ea1ae7e64e91f869440c8dd1da318e35c3e41ad71