Malicious PDF — malware analysis report

Static analysis result for SHA-256 12ec2b7eb3df94aa…

MALICIOUS

PDF

66.3 KB Created: 2021-10-02 22:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 42358c1430699a563f610d386ebbd4fc SHA-1: c4451cba664bbc190ce36a186777966a8e28e062 SHA-256: 12ec2b7eb3df94aabda838e0716e766d3c89ad33681dfd5e44474dab04db7ad0
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a link farm on disposable hosting, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7187

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 http://ecoaga.com/documentos/file/gurexigaverir.pdf In PDF document text
    • https://eravukappalpalli.com/userfiles/file/rimatejilatalawifozejokev.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/23877025274.pdfIn PDF document text
    • http://tdbm.vn/upload/files/60794227296.pdfIn PDF document text
    • https://poker-fire.de/file/suxifazarilegidewokab.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/51433633566.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/16673976732.pdfIn PDF document text
    • http://generoussecurity.com/uploads/33318113239.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/37969591257.pdfIn PDF document text
    • http://recviem.ru/img/upload/sewexipesolubazajobi.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/37858242675.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/99769367535.pdfIn PDF document text
    • http://irfanmakina.com/depo/sayfaresim/file/kunum.pdfIn PDF document text
    • http://gr-chem.com/upload/files/4129213723.pdfIn PDF document text
    • https://felixtrail.com/imagini_ws/xulejagasegabitinunefi.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210914154842.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/72011078920.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/lagemitaxu.pdfIn PDF document text
    • https://gopherscopes.com/userfiles/file/mezuwiledupezitedarexa.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/pezuz.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152eb779d252---12906779265.pdfIn PDF document text
    • https://emmaushuis.org/pages/42379384787.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/22191020791.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=navy+service+stripes+yearsPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/kexotifevomexagigu.pdfIn 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_off0000b10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB10B 14748 bytes
SHA-256: 7aeb24b2424955cc6b484c65c779732ae69579d7469fc6da4d0156d8101d1600
font_01_sfnt_off0000d60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE23 10252 bytes
SHA-256: 15d8e7030b75463d808de5982c26f2f0459b45f8b447135f50fe823bb549a174

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