Malicious PDF — malware analysis report

Static analysis result for SHA-256 b111c3a3d55f1ca4…

MALICIOUS

PDF

65.2 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: ac5c2a42c6630147846c2e57aa42988c SHA-1: 04afea18da481a2e4cb7b3a6e28ab5304de51b5c SHA-256: b111c3a3d55f1ca46e155718943028040bbf228c2ceac6ad4ba75eda0a14a773
96 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, many of which point to link farms or disposable domains. The ClamAV detection and heuristic firings indicate this PDF is likely a phishing or malware distribution lure. Although no scripts were directly extracted, the structure and embedded links suggest an attempt to redirect the user to a malicious payload.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3508

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://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

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