Malicious PDF — malware analysis report

Static analysis result for SHA-256 f222d52886932208…

MALICIOUS

PDF

82.2 KB Created: 2021-09-22 13:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 271fd987f0521ee0bf8905ccfe871db2 SHA-1: 43515df2cf6457d383ce05e8e8d00fe9133ed572 SHA-256: f222d52886932208d4652b4e2a1616a14c05d1c47539794e0fb551a185c80b6a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous URLs pointing to disposable domains, many of which are part of a link farm designed to redirect users. The presence of a 'download button' heuristic further suggests a lure to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=escape+games+iphone
    • http://ayurveda-shiatsu-nice.com/upload/files/kejako.pdf
    • http://chukysovin.com/img-svc/files/jiwovivibopobuxaxamiz.pdf
    • http://topup-fight.com/ckfinder/userfiles/files/76830850614.pdf
    • http://travellightnepal.com/userfiles/file/80871715330.pdf
    • http://apicn.net/upload/files/24897811448.pdf
    • http://julianina.dk/upload/file/botefojanobejesiw.pdf
    • https://jamurgoreng.net/contents/files/jorumawawemixana.pdf
    • http://humidorio.de/ckfinder/userfiles/files/31391220342.pdf
    • http://salukool.ee/upload/userfiles/file/86497539299.pdf
    • http://inlovehuahin.com/file_media/file_image/file/90685466591.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16133f87b58105---nikirixavezewovurezizike.pdf
    • https://queensflower.nl/clientfiles/84932797473.pdf
    • http://apisicul.com/userfiles/files/55439785780.pdf
    • http://onlinemidias.com/ckfinder/userfiles/files/78521876865.pdf
    • http://musicpark-live.de/userfiles/file/jasiwiw.pdf
    • https://wodepcb.cn/uploadfiles/files/5531686072.pdf
    • http://geopraxis.it/userfiles/files/pesufewajowotibogex.pdf
    • https://tourpon.kr/FileData/ckfinder/files/20210914_F751E50E189D6A37.pdf
    • http://topflexsports.com/uploads/mufunasu.pdf
    • https://snapstudios.ca/userfiles/file/10997781553.pdf
    • https://globaldreamindia.com/webcms/file/pesujenefuwozutavage.pdf
    • http://ledspectrumthai.com/ckfinder/userfiles/files/62380020680.pdf
    • https://10fci.net/userfiles/file/kivixudikodovos.pdf
    • 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_off0000dc5b.bin
7e35eac5beab1358eabf460fb8fe2169ffaed2146132a81d35b5c96898456658		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5B 10560 bytes
font_01_sfnt_off0000f43e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF43E 16792 bytes
font_02_sfnt_off00010c50.bin
e5ea35465216e917a1361b8196b898dcf006d593b2ca3bfba3ada30af7cddca4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C50 18196 bytes

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