Malicious PDF — malware analysis report

Static analysis result for SHA-256 74f3691cdd223b57…

MALICIOUS

PDF

77.6 KB Created: 2021-09-09 08:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e5e575803c8348adc579bccac00a9656 SHA-1: 68c21eac6a10ad4b5c8890424347ff5632f915f3 SHA-256: 74f3691cdd223b579b14b201163279c88cd8638a44f6255d310518e09942638e
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 numerous embedded URLs pointing to external sites, some of which are flagged as link farms or potentially malicious. The PDF structure and heuristic firings suggest it's designed to redirect users, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://marblo.marblobaths.ph/app/webroot/img/files/tamadilenijiza.pdf In PDF document text
    • https://mldom.xyz/web/img/podborky/files/15415097490.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/bujipoke.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/7854170440.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/rivopobomutebu.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/92228631782.pdfIn PDF document text
    • http://hasyo.net/files/file/52668223937.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/gulezapeka.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/68373940247.pdfIn PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/20783126938.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/5146812052.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/4607646645.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/80993515466.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/jopafewin.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/75181138033.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/lasojirodilekedazivivet.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/tewezetekesixobafugeseg.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/14673250937.pdfIn PDF document text
    • https://verner.lt/images/files/63814366012.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210901_E9A72F846EDD7163.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358eddeb347---novojibidegud.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/tibatokiwomuj.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/weworamemodovisosigepodij.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388e4eedb12---53315199860.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/jaromamupugurodedulolujo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=pes+2013+iso+ppssppPDF 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_off0000cab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB5 10204 bytes
SHA-256: 3a2d7f91d668849fd4f8b4e5d3ae81785b6398486dad536fd8de4d155f4abbe6
font_01_sfnt_off0000e1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CA 18208 bytes
SHA-256: 38196737b1f9e16eee12428d10f71e257471cfb70a597ff8deb8fbb425fa4b03
font_02_sfnt_off000110ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1