Malicious PDF — malware analysis report

Static analysis result for SHA-256 30ea93535b7a57cf…

MALICIOUS

PDF

72.4 KB Created: 2021-09-20 23:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 01324e865af221d2bbab6e9b0bed613b SHA-1: 790c9eef051d1267dc48fab27200951daf812379 SHA-256: 30ea93535b7a57cf57c783059e9c269f7a1dab0bd9af9544594d8e948fb02ec5
134 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 embedded JavaScript and numerous external URIs, including a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded JavaScript points to its use as a delivery mechanism for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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 https://philabc.ru/uplcv?utm_term=zombie+infection+mod+apk PDF link annotation
    • https://sindhuinvestment.com/ckfinder/userfiles/files/58723229919.pdfIn PDF document text
    • http://cissi.it/userfiles/files/10905352617.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/kikidaxuruzezovewax.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/mixuvamuvakowi.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/66907217160.pdfIn PDF document text
    • https://unaizahic.com/Files/files/33483174342.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210907140730081.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcd4d1faad---38051547434.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/vipatodopemuj.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/28668688186.pdfIn PDF document text
    • https://aspirans.com/files/file/totunej.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/73309454763.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/44458291325.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/ronefuwaxak.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/zanedopotozogokulinom.pdfIn PDF document text
    • http://gardatrans.com/content/Files/15185843868.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/rapusegolobawa.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/75394640661.pdfIn PDF document text
    • http://lagrupacio.cat/file/72993369054.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/da420fa6fec61875ee3a42805a81adc5/14438153167.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210908111406.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/berepagujitubalotali.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/25109947704.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/51238334918.pdfIn PDF document text
    • 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_off0000b9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9AB 16180 bytes
SHA-256: 7d38f120bd39b61bb7535ab2f29525b599fe03e0fcf6ae282982b84ee0a02301
font_01_sfnt_off0000e3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF1 10664 bytes
SHA-256: 194a1240e1481c9a03ad2b1be70bca57b82d60ec8ea2d72a2febbb237d7d2cd1

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