Malicious PDF — malware analysis report

Static analysis result for SHA-256 d672965f847aff3d…

MALICIOUS

PDF

70.3 KB Created: 2021-09-13 23:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 33d1f32e14ecb9b2a883450d1b732436 SHA-1: 4c07e67a4a60c3996f7942e9d5e6eb4bde55472a SHA-256: d672965f847aff3d1f1df57ee4a8b674b5dc34d1678568904303dcc6a09aa1be
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, including one pointing to a raw IP address, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with malicious documents that often embed JavaScript to facilitate redirection or exploit delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://locke-3c.tw/uploads/files/202109112116575459.pdf In PDF document text
    • http://sgd42.ru/userfiles/file/gujegotalijar.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/10899110192.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/49189631616.pdfPDF link annotation
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/lililekewibinetogam.pdfIn PDF document text
    • https://1000families.eu/userfiles/file/xaligokubogilegerewit.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/49615521490.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/jupegopaduxetatubaruw.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffc15e8102---92374654880.pdfIn PDF document text
    • http://schokozentrale.de/idata/86990238817.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/jizinezowapokoguze.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/6705467618.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/goronad.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/buvoduf.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/pokevupel.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/5139050347.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/43489886857.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/digozosemubarurifubu.pdfIn PDF document text
    • https://adproissy.emailingmanager.com/uploads/editor/file/79851871597.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/towuk.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/xalunezimapujujolaporiwe.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/89803719150.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/pufukeleduvisek.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/8508895598.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/75061526562.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210908025727.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=wifi+hack+password+show+app+apkPDF 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_off0000b5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A3 10508 bytes
SHA-256: 33576a4966e8bc64de9f033126f5ed57dceb14cfa34a429e72ef6acec6b35538
font_01_sfnt_off0000cdc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC0 14912 bytes
SHA-256: 7f8b92ffeb6ceacf33a3995439764a39a8521b81f19efb7c4bf33e91f0591f40
font_02_sfnt_off0000f37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1