Malicious PDF — malware analysis report

Static analysis result for SHA-256 70efcb0575975d2a…

MALICIOUS

PDF

88.6 KB Created: 2021-10-06 16:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4e3c0a6d59affebdbc8e4a9ce160a34a SHA-1: ffbfaf19b6cd94a1cd47b89966fd228d273bbeba SHA-256: 70efcb0575975d2abbbdaca3cd6189bd759f07907e985050a7fc3b692b7112c7
134 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URLs, suggesting it is designed to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports that the document is part of a link farm hosted on disposable domains, commonly used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=oh+my+baby+boy+i+love+you PDF link annotation
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/30569999744.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/59895830554.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/tiwafufizegugowigatuborug.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/wipirezekumutoxeluvupu.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/89700147127.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/rapaderag.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/63737406146.pdfIn PDF document text
    • https://ewt.cz/res/file/55960733398.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134513f9a822---12549672310.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/nixevolizebapawojuva.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/nitufenewedenet.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/60330167787.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210917_210543.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/niteratonukotig.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/43126804491.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613479dac44ec---fefulapatuxobifuv.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/62863973699.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/kuvajuxom.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/poxivozokobinepi.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/35317033730.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/gegajunonadaj.pdfIn PDF document text
    • http://bienbao.net/uploads/files/dudivukajebuvozuneze.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109010626262801.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24770770754.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/nososibebivubigif.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_off0000f276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF276 19036 bytes
SHA-256: 6e26ba86f0a7faf24e884525ec82a5be1adaee6afd55e14c8e724a77b4913f14
font_01_sfnt_off0001241e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241E 10348 bytes
SHA-256: e458ff318a08926c25b4b19d69d44ac3ef6a9914ea3a0f42569508efa7e0a838
font_02_sfnt_off00013b79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1