Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2c5e3e2de894da7…

MALICIOUS

PDF

93.3 KB Created: 2021-09-11 06:16:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 43d55a7bf24f3e58ac9464acf870435d SHA-1: e7334a4b9c8759b397b7cb3a0b55c2f8ad11560a SHA-256: f2c5e3e2de894da73641ca7c15cba16b705b7b4c771880a6a2ec8baeefc89a47
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://laborke.ru/uplcv?utm_term=the+black+jacobins+pdf PDF link annotation
    • http://ilkemymm.com/image/files/35512713002.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/kuxoxe.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/tixafuzax.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/66695879267.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/11761730998.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/xijugusar.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/19501004768.pdfIn PDF document text
    • http://skisun.it/userfiles/files/dopomi.pdfIn PDF document text
    • http://asid.rw/userfiles/file/85263219434.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/69164685798.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/vosaxikazosaxivage.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/2594750946.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/famefipuwi.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/gafenejezeto.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/60139123481.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/76778354404.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/nozamumukili.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/jamonedosetugomedoko.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161382f3a67a97---64109936139.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/73847941441.pdfIn PDF document text
    • https://norservis.info/files/files/jobezafixogow.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/talovimade.pdfIn PDF document text
    • http://konyanincigkoftecisi.com/userfiles/file/zavom.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/54102359512.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4c948ab4a---82650137356.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/gikusenuxotafolenakasa.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_off000104cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CF 18916 bytes
SHA-256: e516a67893d8c790ad4a1065d83cd5548b88d8f28c36ce10520c200b319f9bed
font_01_sfnt_off00013668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13668 10844 bytes
SHA-256: c248bca7c88f6a28ef76866487d34bb185c83fbab888d9b7df6afa7a82c15dd8
font_02_sfnt_off00014f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1