Malicious PDF — malware analysis report

Static analysis result for SHA-256 841ea7d776e94ddf…

MALICIOUS

PDF

69.8 KB Created: 2021-09-11 01:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dfbb185510925532cfa8ba86e7ecbc70 SHA-1: 100380ef346bed83096765f0f9a808e724fc7d5b SHA-256: 841ea7d776e94ddf26d5e5c819f77c4964f0ec9b00634efdb0ea64ccf7e54cb1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, with a heuristic specifically flagging it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious websites, likely for phishing or malware distribution. The presence of external URIs and the link farm heuristic strongly indicate a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 https://manenshop.com/upload/files/10184719699.pdf
    • https://stomatoloska-ordinacija-rijeka.com/files/4655221621.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341b574f4cf---75347895000.pdf
    • https://sealordhotels.com/ckfinder/userfiles/files/18099508046.pdf
    • http://baobianhkhang.com/upload/files/doluluwekose.pdf
    • https://polaria.cz/images/file/wedozin.pdf
    • https://bahceneryaman.net/public/content-images/files/31418113806.pdf
    • http://thueotodn.com/uploads/image/files/38609848961.pdf
    • http://esistore.de/userfiles/file/bezelazatiterotaxix.pdf
    • https://nk-sostanj.si/files/file/fodoriwufategatukobix.pdf
    • https://cpsguffanti.it/uploads/file/2504049004.pdf
    • http://doanekeyes.com/userfiles/docs/77795389025.pdf
    • http://huonglonghotel.com/uploads/image/files/dururonutetikogaxejadutu.pdf
    • http://camonetinternational.com/files/file/soxuwosupapu.pdf
    • http://obkladacstvikolar.com/content/xoremanil.pdf
    • https://sandp-engineering.com/ckfinder/userfiles/files/84646744174.pdf
    • https://cancelaria.pl/galeria/file/67589028766.pdf
    • http://sjar-tech.com/uploadfile/file///2021091103341214.pdf
    • http://learningkey.org/userfiles/62579923139.pdf
    • https://thietbivesinhanhhuy.com/asset/files/52868867699.pdf
    • http://dayou.tw/uploadpic/files/202109041801552737.pdf
    • http://elosc.com/upFile/file///ITX202109080201316491.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3b44cc730---sokuxonufufepero.pdf
    • http://tencanpowder.com/d/files/naxazoxogukafifozaro.pdf
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/bufilatilefola.pdf
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/58701247324.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=empathy+box+do+androids+dream+of+electric+sheep
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b24e.bin
7f88ca986580472ccf4a8d2a1bd71d47f13e712a6676a0984560d901094cb318		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB24E 11224 bytes
font_01_sfnt_off0000cc3a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3A 16792 bytes
font_02_sfnt_off0000e44c.bin
5be4517e0697ed653be14b6489f56d9486426354d907e679e81d731f0ed55363		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE44C 14744 bytes

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