Malicious PDF — malware analysis report

Static analysis result for SHA-256 bae65ed11e995160…

MALICIOUS

PDF

70.5 KB Created: 2021-09-26 19:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 58b5a2ff26dac417503472ca52880dcf SHA-1: 2b0ffe8db94ff1de8056db85a7290681c0b7bc09 SHA-256: bae65ed11e995160fa8fbc1d36f4aa6e779bbad04738d289a1a08a00a30ba9cd
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct domains, likely to obscure the ultimate malicious destination. The embedded URLs and the PDF's structure suggest an attempt to disguise malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://recuva.kr/upload/fck_img/1630612497/file/30097020119.pdf In PDF document text
    • http://instalace-charvat.cz/userfiles/file/35706530417.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/8395957449.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/249015838.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/10883781855.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/datonet.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/59272774786.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/xonafaporu.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/nuvivuwun.pdfIn PDF document text
    • https://tckontrola.hr/files/78936685504.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/japatuzolesutusasefoxox.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/75436482891.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1614b6839754f7---58123492713.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/jagesejojufa.pdfIn PDF document text
    • http://hexindechem.com/upload/files/27237036695.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/kevifurewi.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe51835596---zikeku.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/pegurimakibonudigadani.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/wekonekunodokabizivemaku.pdfIn PDF document text
    • https://krossi.ru/images/content/files/fuvomijuge.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/punupabagaledoxedoweduped.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/zefot.pdfIn PDF document text
    • http://dnestrovsk.es-pmr.com/constructor/dnestrovsk/ckfinder/userfiles/files/vexuzoxogamumanire.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/modugibikipakubevitixed.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/loduregab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=catching+fire+movie+onlinePDF 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_off0000b181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB181 16660 bytes
SHA-256: b2969313c649f39069cc12cd68631ea7b12140903417a7acfbccd2ca2107b54e
font_01_sfnt_off0000dc30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF447 10712 bytes
SHA-256: 9385fbac3d69e2f53bda09235579d0601ce8d29aa36a77047834373559a9cc12