Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ae13aa9947e4f74…

MALICIOUS

PDF

81.6 KB Created: 2021-09-16 14:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d38bce53e24f8f94c1c8451d55fd9daa SHA-1: 15cf6385a95a7cd439b212d6d945e126179912e4 SHA-256: 9ae13aa9947e4f7419097b437b5465924f223ffc6c68933f21060e802feb955c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to redirect users to malicious content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a deliberate structure for this purpose. While no scripts were explicitly extracted, the presence of external URIs and the overall structure suggest an attempt to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://coretry.ru/uplcv?utm_term=khatrimaza+mkv+movies PDF link annotation
    • http://quincy.pl/ckfinder/userfiles/files/zuxeno.pdfIn PDF document text
    • https://ags-car.com/upload/files/zubaletivuxorupimebugijo.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/kerazakog.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/bizazu.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/69498446447.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/84210144858.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/witega.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f8c563ddbbd809c1f2d8c945de0c1d6f/6565669162.pdfIn PDF document text
    • http://nature-revive.org/files/file/68868921338.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/65866859340.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210908002846.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/34581204883.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/zabeburetus.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/jevitomefevopulawemer.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/33678717371.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/12726043156.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/vawuga.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/sozod.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/rarirudaxulajejijopawop.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/xofaz.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/sobidawazerawi.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/52503262215.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/88804038513.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/10232349071.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109110447057045.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_off0000dd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD70 10432 bytes
SHA-256: 333c2f39e3a4536cfdbecb3c486b15c608783d03c5cbaef886a079f291884d21
font_01_sfnt_off0000f538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF538 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4A 16936 bytes
SHA-256: 595528821405ae9d5813554561683977261f80b3701b8a579c4602f4748a49aa