Malicious PDF — malware analysis report

Static analysis result for SHA-256 774814d55bce5305…

MALICIOUS

PDF

93.0 KB Created: 2021-09-13 17:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e5c5fb91d30244b8c71562b40bd727d4 SHA-1: 2f00a7e8686cb9c2c3662f8bac6994b191b40755 SHA-256: 774814d55bce5305a94b9b62ad2273e2a75d01eb8575812af949fc01cd4d9f92
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=nomcebo+zikode+songs+2020 PDF link annotation
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161347a33a61af---zosufudam.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/nubupetituvukusuwax.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1631390213.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/jarorotelewomidorobiboko.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/lanitozonekim.pdfIn PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/pufasuro.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/dadobijulekavoxemojem.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/67159512729.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/86018683409.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16130458a77e28---36436768611.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/zipumegiwizonimuzuk.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/82278458193.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/23360876711.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/jadoxasiwizixugesox.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/2120513214.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/48313042994.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/nunanopifaxewi.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/62329590220.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/39901852974.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/32487152361.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/77705342770.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/40992729831.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/42054052746.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/nujezaxikexuz.pdfIn PDF document text
    • http://splogservice.ru/content/file/jurizapidebijodaj.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/lokefesaro.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85F 10816 bytes
SHA-256: 116e9eca2485e86dc3065a05b684d765f8afbb2adce9917096c121a6c59b432a
font_01_sfnt_off0001011e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011E 19364 bytes
SHA-256: 5c74d4f4a4a6fc3c663fc4ce5306475676468768c70308f0ed8165dc6d32f2dc
font_02_sfnt_off0001334a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334A 17472 bytes
SHA-256: cfbafb480152fdcc906a9be64ce67ccd64f6d9a408d2d4675346ca98cbe228f5
font_03_sfnt_off00014de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1