Malicious PDF — malware analysis report

Static analysis result for SHA-256 a04c50d7810f5c2c…

MALICIOUS

PDF

67.9 KB Created: 2021-09-09 20:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: ce1b54f384b5413ea733200f0abe72b3 SHA-1: e3653e802ba0e558ecde07ea9d2a28d68991998d SHA-256: a04c50d7810f5c2cc30e0aef8d35d6557a5d2377de1f15e0b26f0d14eeeccc4f
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users to malicious sites. The presence of numerous external URIs, many hosted on potentially disposable domains, strongly suggests a link farm designed to obscure the ultimate destination, likely a phishing or malware distribution site. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4816

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://casaperferiesantamariagoretti.com/writable/public/userfiles/file/17658301878.pdf In PDF document text
    • http://agierresrl.it/userfiles/files/75540855661.pdfIn PDF document text
    • http://guitarenko.fr/img/files/kiligarejiwijepepimom.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/75956057020.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/41412112076.pdfIn PDF document text
    • https://serka.com/serka/upload/files/pikijinav.pdfIn PDF document text
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/58531372543.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394668325dd---29195983067.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/16488157424.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/73879645261.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/monuzegesifenizibomabifux.pdfIn PDF document text
    • http://huiking.cn/uploads/file/050447243361.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/gadudalugubezej.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/bilebejujar.pdfIn PDF document text
    • http://imdmotors.com/uploadfile/file/2021090721482455.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/difiwupapokujonolilewa.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/5363797418.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/84197319119.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__61312BF0BF65E.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/78473248509.pdfIn PDF document text
    • http://wawa757.com/uploads/files/42521470250.pdfIn PDF document text
    • http://sql110.com/pic/bixafosekarebugafosem.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613970d2974bc---86827789813.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/32041855990.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/jonobomugewapis.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/92556245052.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=samsung+galaxy+note+8+specs+release+datePDF link annotation

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00010701.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10701 2653 bytes
SHA-256: 1b2568700ec2d3fd90f0cd6586fde4a4115b74048189caa7778d7d50b33dd9f5

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