Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2926a504415f9c8…

MALICIOUS

PDF

68.3 KB Created: 2021-09-25 23:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bd513a4cc75a27b1d0483da9cd12fb5b SHA-1: b86fd5d7a8efd076c1d479938337484b4159e620 SHA-256: d2926a504415f9c858c05d034384a39e172858e369091c2f39393223aa5dc3d7
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic findings point to the document acting as a link farm, directing users to numerous other PDF files hosted on various domains, some of which appear disposable. While no scripts were directly extracted, the nature of the PDF and the presence of many external links suggest it is part of a phishing or malware distribution scheme, likely involving spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://camping-du-lac-dijon.com/userfiles/fichiers/rorovuvazabetapupatexe.pdf In PDF document text
    • http://0575zl.com/userfiles/file/47567044144.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/9472477999.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/zadenuvivadofota.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210906060700827226.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/35353113467.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/ligepasaludupomufu.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/xipef.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/gozepagobogikedusufuzixa.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-21/20210921140251589742.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210917_233915.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/32537856110.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/wusawotojubunogeki.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/ranevedazivikitete.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/161475026a88bc---rixelomofavesuwu.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/zotanowobime.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/91957937290.pdfIn PDF document text
    • http://hanauhrova.cz/files/pidedagoxo.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210910121532253235.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/66516982575.pdfIn PDF document text
    • http://demkapi.com/resimler/files/27841145294.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/7063221347.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///97552721727.pdfIn PDF document text
    • http://chikatere.com/Upload/files/pudidazewikasup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=han+esport+v4+apk+downloadPDF 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_off0000ae7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE7E 14768 bytes
SHA-256: 9370fb675e16a6aecbf38e2535323eadba43ab15610967287415c61660791948
font_01_sfnt_off0000d358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD358 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6F 10604 bytes
SHA-256: ecb6a65c8473b94fc94ca03950123238afce9978991e49d966d3129792d35a16