Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0e147ab8775e765…

MALICIOUS

PDF

75.5 KB Created: 2021-09-19 02:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 23965bd8af32ead033d04d43ec568406 SHA-1: 8962ad1a7b9c7a43ab25060af9f96698c85457f8 SHA-256: a0e147ab8775e76520e92b5af4a2af88574e16289f2eeb73f804da2e488bdb8d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics identified it as a link farm on disposable hosting, with numerous external URIs pointing to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://inwebjor.ru/uplcv?utm_term=words+that+start+with+b PDF link annotation
    • http://shipagents.nl/uploadfiles/file/vigikubakumexizejo.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/97912864944.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a05b9d2cf9---1971754530.pdfIn PDF document text
    • https://aayams.com/userfiles/file/benuk.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/cbf94268adbcb8deea0f22c213ec658d/46132138883.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/45815263629.pdfIn PDF document text
    • http://cochemical.com/upload/files/20114126528.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/romol.pdfIn PDF document text
    • http://yejida.com/userfiles/file/zapozudifolamokevilu.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/tarisurexilelawunutif.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/89976622128.pdfIn PDF document text
    • http://freestyler.cz/img/file/ledorazabirogipidi.pdfIn PDF document text
    • http://skisun.it/userfiles/files/mirutunoso.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1631142689sageruwugi.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/41064476799.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/61755769085.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/tozolekivaxedogogu.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/durijivo.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/64595866256.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/jeledekovedemupivavo.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/fevef.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/kuxosaned.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_off0000c7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCB 16196 bytes
SHA-256: 490bc1b381d92f78c23d23bda975c5cefbd1ed84eedf2c40f7ed0aeee8e04b2d
font_02_sfnt_off000108f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F3 10280 bytes
SHA-256: ba5e752d8697d84e7a222fd28a40bcc0a46477b7663dc5ff5f49b841a3234716

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