Malicious PDF — malware analysis report

Static analysis result for SHA-256 58f470dcf12b516b…

MALICIOUS

PDF

95.3 KB Created: 2021-09-18 22:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cba6229012ea6bbc206815b39f5bccaa SHA-1: 144d786f9e9c7434687bbc81db8a82500cfce189 SHA-256: 58f470dcf12b516baf1d0f92c31ec789f6e4769df06744b7dff39a19b8ed0919
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The high-severity heuristic 'PDF_RANDOM_URL_LINK' indicates a link to an algorithmically generated URL, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm the malicious nature of the file. The embedded JavaScript likely serves to redirect the user to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://maciejabramowicz.pl/upload/files/file/sirawotusa.pdf In PDF document text
    • https://owop.challengersports.com/userfiles/files/sodalakivukemoj.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/gabubewitaxubosu.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/biziviros.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/nuzufetu.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/83735250118.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/46824040323.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/15095061264.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/93980415260.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/8486194118.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/96193113545.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161411021b57e5---folab.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/uiga42qfgden4a3tjq6kpc9l70/96098474512.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/5605635373.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109090025224420.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/fubixokizivu.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/81566321224.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/lokomava.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/99887640144.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/52274069588.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/64662176538.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/95374688318.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=is+27+a+prime+number+or+a+composite+numberPDF 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_off00010a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A77 10852 bytes
SHA-256: 01fc7fc644bd44414a8e0ba27d733b262c5911ecac1a0627179de87349d2c07b
font_01_sfnt_off00012373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12373 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B85 19648 bytes
SHA-256: b8d2b3ca5c26dc2e83b8ebf6d88c45ba97ff98fe876f6256f7eab4856306ce56