Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf4f7d341a65fd61…

MALICIOUS

PDF

87.7 KB Created: 2021-09-09 16:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2fc06e45903fd74bb3a95b3751068dbe SHA-1: 4348345f5f90540aa556ee37d2961e2abddc1bf9 SHA-256: bf4f7d341a65fd61cd4ba01a071293ea8be6f8abb2befd3c5771b561725805a5
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic strongly suggests the document instructs users to copy and paste content into a shell, a common technique for executing malicious commands. The presence of numerous external URLs, including one with a 'free fire id hack' term, points towards a phishing or social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://laborke.ru/uplcv?utm_term=free+fire+id+hack+termux PDF link annotation
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/zigojeduxulasuzer.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/44671289395.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/28774975324.pdfIn PDF document text
    • http://villkasz.hu/editor_up/zoxobizaxezofarijejejeji.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/18433430340.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///doxakazebebebato.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/28266510315.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/96258539421.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/99855356970.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/92308131811.pdfIn PDF document text
    • https://botroul.be/uploads/49688899047.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/44088349028.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/34721792243.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/41940525528.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/48813902522.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/34844725516.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/rasupezajupomesojukifa.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/52738650895.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/75724899349.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/59667582108.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/gopetopa.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • http://eot.mn/uploads/userfiles/files/79211553279.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_off0000efcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCD 10576 bytes
SHA-256: 4cc44cbab62db42e4dfd57a4b1a23adba4a7848d1ab8c3bb55e0397e1654f8b3
font_01_sfnt_off000107ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12001 19044 bytes
SHA-256: 79fc50f4d3013bbe3dd2f9b05f3c08f2e9b612823639d4e3e9e86fcedaba1d86

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