Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3c8db6be93cf37f…

MALICIOUS

PDF

80.6 KB Created: 2021-09-17 15:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1658c7aee8f1ffe89c666b2e222624d6 SHA-1: 0ce5268bbc0a09e3d5bad7ece71938c3f9a685c2 SHA-256: f3c8db6be93cf37ff2b8e9ec9a37200c1a2b7580b1295c1fe0b4f100f40df489
166 Risk Score

Malware Insights

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

The PDF contains numerous links to external domains, many of which are flagged as part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the PDF_RANDOM_URL_LINK heuristic suggest the document is designed to redirect users to potentially harmful content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://birzebbugastpetersfc.com/files/file/11436207886.pdf In PDF document text
    • https://virtualpulse.eu/UserFiles/file/tuvalaweda.pdfIn PDF document text
    • http://czyxchem.com/upload/files/regarumikozizuriradesonap.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/61138471198.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/17715594549.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/kiwabewava.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/5277513006.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/tajis.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/namujujedalew.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/65981806185.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/tozosedebo.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/85119988986.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/43972875729.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/petab.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/56478878975.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/zofuvakuvejokokagazufami.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/f6da0127b603ca805f84423f86f059f2/fogeni.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/vegojexi.pdfIn PDF document text
    • http://icaalliance.org/filespath/files/20210916213557.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d33b027ac7---19410109173.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/6446478384.pdfIn PDF document text
    • https://redac.ch/upload/85624838163.pdfIn PDF document text
    • https://blogsma.com/files/88740371792.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=ultimate+hitchhiker%27s+guide+to+the+galaxy+pdfPDF link annotation
    • 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_off0000d608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD608 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1A 17064 bytes
SHA-256: 9b1689b7ec58e7f33fcc826f171da920203f29b2971b00a3e3e1b496652f66fa
font_02_sfnt_off00011a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1F 11412 bytes
SHA-256: cb2b5bdbed9c929a45bedd3c5eadc583b0f7fa3f808ad7cf649927ddbd4327c1