Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9b6883d5489844e…

MALICIOUS

PDF

76.8 KB Created: 2021-09-22 12:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8aacbff4aa8420bd86a5af0628a6b78d SHA-1: a7d0721a92931660cc67b521f28f52a6fb4d82ce SHA-256: d9b6883d5489844eaf4ff6740ce5b518de707ecc32e7594d0d62322036484c57
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of PDF URIs and the overall structure point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://laborke.ru/uplcv?utm_term=monster+strike+apk PDF link annotation
    • http://directartdeal.com/uploaded_files/userfiles/files/ziroxakazuzubo.pdfIn PDF document text
    • http://hypovyhody.sk/res/file/47474261490.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/58347180866.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/7651546536.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/legozoraguxutu.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/xapetuvogu.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/puforor.pdfIn PDF document text
    • http://archive-2014.humandoc.pl/attachments/file/87210184708.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/62301103125.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f6c01be8e---medobafikuguvadifuvotupup.pdfPDF link annotation
    • http://greenhere.cn/upload/ckimg/files/202109040730383962.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/65306283377.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/jumetu.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/23193867461.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/jakazusewolutubuziwekixo.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/nojapatujewuvuwutimuden.pdfIn PDF document text
    • http://school15-tyumen.ru/f/94725241465.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/jewim.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/bidaxeromunedi.pdfIn PDF document text
    • http://www.zaluziemalina.cz/userfiles/file/dapimiruloranolamid.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/rukiwifopez.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/21360541489.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/29529267609.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/telegenuji.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_off0000c38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC38D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9F 19920 bytes
SHA-256: 01af2cfd386e342103c77e12c83a6ba0b6cbdd0856e9c2b538798d75b824aa6b
font_02_sfnt_off00010ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC8 10284 bytes
SHA-256: 84d3dec7cdc01b437ac7f529f8bde2cfd7b7b5f2ccc60973a609eb19129b1f20