Malicious PDF — malware analysis report

Static analysis result for SHA-256 916502b5d80deca7…

MALICIOUS

PDF

70.9 KB Created: 2021-10-02 18:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 035e6c7b13235e2b7a0fe5a629353f31 SHA-1: bf8b17ea08b4965181b23eb8df022c22db0b0da4 SHA-256: 916502b5d80deca7871cb35a084377220f1bb254ae0558e1906fa6dabde029c7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attack pattern involving redirection to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • 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://ddnepal.com/assets/userfiles/files/nemosivowev.pdf In PDF document text
    • http://thebankcardservices.com/uploads/files/35754686244.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dasizowewomemo.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/xonazusamaju.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/lidelofigulup.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/betoronujabamamenaxosava.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140858e6d1cc---sosin.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/fifewawaxadasewawubiz.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109051133056173.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/towefefurawivorejulekofe.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/94483562871.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/93338587854.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/lepor.pdfIn PDF document text
    • http://plafondchauffant.fr/img/user/file/12202145679.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/30242665478.pdfIn PDF document text
    • https://festacontinua.it/public/file/suwamivuwobokukizodovu.pdfIn PDF document text
    • http://rrarental.org/upload/file/45937351218.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/45669037689.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/24090628194.pdfIn PDF document text
    • http://sun-eko.eu/files/file/masutowokumojadizogaboze.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/niziteminakopotupemurub.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16133c8d74bfb7---7211838728.pdfIn PDF document text
    • http://weingut-suppan.at/files/41324729357.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/sexenovakajokige.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/67226184004.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=words+that+rhyme+with+touchPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000b174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB174 10776 bytes
SHA-256: 5c9954f2a35c071e066c785d14f961af71e47458b8eb8382218dcda4acadbfdc
font_01_sfnt_off0000ca63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA63 16956 bytes
SHA-256: c160c6eef85a61bf580e486ffae3062f3ae9f5405182ce4adce8286b1a6ffd49
font_02_sfnt_off0000f621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF621 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1