Malicious PDF — malware analysis report

Static analysis result for SHA-256 54ae1ca866d861bb…

MALICIOUS

PDF

82.4 KB Created: 2021-09-23 13:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b899d8c557e36fd62d2571fc28d76394 SHA-1: 2d03d4e2481d637612fd55d797f931f4e9269dff SHA-256: 54ae1ca866d861bbd39be0391b5e352731d28cbd95c9f52aa018de0f209e375a
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The embedded JavaScript and numerous links suggest an attempt to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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
  • 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://abimobiliare.pl/pliki/File/sejedotivapawano.pdf In PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/29064269383.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/41208355389.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/famabu.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/bonajaw.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/87468000640.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/sekemikafinumoxunopi.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/ragubosogedilamezakakupon.pdfIn PDF document text
    • http://mextro.de/upload/files/dupejulosemubowanopig.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/42848216764.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210922/0213082461.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/gapilokutuposoxidowexeg.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f6fcde906---lugigukexofara.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/29983725841.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/870297150.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/kuzosaxijoxaf.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/lamimidozozuzoxam.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109062046525615.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/67505527083.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/83819547327.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420c3404aaf---45572204831.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/45229643404.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/worajebi.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/13948037158.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+break+android+lock+codePDF 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_off0000ddcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCD 10504 bytes
SHA-256: cd1e923d015aad28b57bc160e6858977472b8bba69c400fcad5bb63da2706110
font_01_sfnt_off0000f5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDF 17908 bytes
SHA-256: 6b449866d6fcba58ba314db84ffc8fb032e2c700005ff9e54dbee8b044d4ebbb