Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5c303ccf74d4411…

MALICIOUS

PDF

83.1 KB Created: 2021-09-10 11:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b04178a112c5b00107679d690c6f0fed SHA-1: 6a2e9ae9a98c2033145f21b69f40de36558346f7 SHA-256: b5c303ccf74d44116d784274969e99e56f0a2080a57942370f4939f347f99d5a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to suspicious domains, and is flagged by ML classifiers and ClamAV as malicious. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high number of links on disposable hosting, suggesting a tactic to obscure malicious destinations. While no scripts were directly extracted, the structure and heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://hotelangela.hu/userfiles/file/xulepopavuto.pdf In PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356eaa8cce9---49053230762.pdfIn PDF document text
    • http://proetcontra.hu/userfiles/file/rivuxija.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/81429541632.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/wigusevazasanufijutu.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/25875694106.pdfIn PDF document text
    • https://susta.vn/userfiles/file/jijerukebiwepewemazuki.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/wenef.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/11011767769.pdfIn PDF document text
    • http://panteres.com/files/files/65620212126.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/vixafisovafeb.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/45398057552.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/lelawevupupozojazesixud.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/talepak.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/43236622468.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/8093438241.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/91548168644.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/9291330664.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/jugulipipesarabidis.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/xememulajukag.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/68674694014.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/ralopa.pdfIn PDF document text
    • http://ucokampen.com/media/files/xokawalokonijorapev.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/jitazuparofepu.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210908_5F6A89C30C291C99.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/44020431820.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/vuvikanoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=lego+star+wars+tcs+play+storePDF 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_off0000de42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE42 10508 bytes
SHA-256: cc85157f0711ad9d39ef3dd3103af265a47f1712f29bdffde3554afc20aa3a1e
font_01_sfnt_off0000f672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF672 18144 bytes
SHA-256: 62aa6c0c540ad86184d1780d029b2d52e553a4498d6cf8325a363bd48f43f889
font_02_sfnt_off00012616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12616 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1