Malicious PDF — malware analysis report

Static analysis result for SHA-256 83fd4a081a79a442…

MALICIOUS

PDF

86.1 KB Created: 2021-09-13 07:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7c5c2c9ebeb64fe53d7187a938ce1a06 SHA-1: ed8b6eb7d6101d914f8d211e854ac13ec0b53e9c SHA-256: 83fd4a081a79a442f234e68d1d68db46f06053b3c30aeea9ca19b755b4631458
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to external PDF files hosted on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these links are intended to create a deceptive web presence, likely to lure victims or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://duepassidalcentro.it/userfiles/files/37336302672.pdf In PDF document text
    • http://soluzionebenessere.eu/userfiles/files/bakumup.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613add589388c---94274412613.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/pifemejerexep.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/7705902702.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/nalitonakefoduzerupu.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/maxona.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/34616536118.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/wepove.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/l1qks653s00eddp7e1muok5r73/17822006353.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/47213700070.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/96328058981.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/wojotugun.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/widuxibezu.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/rijelivi.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/noledekudifegudajax.pdfIn PDF document text
    • https://stopserv.ru/files/file/ninibex.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/doraratonafalidinolipeba.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/21480576702.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/22179223665.pdfIn PDF document text
    • http://lovesenergy.com/file/57008147561.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/24078326974.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/94780603921.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/30695144101.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=kotlin+dependency+injection+frameworkPDF 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_off0000e90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90F 11028 bytes
SHA-256: c4fc59bf21e9e8a25a3fdd01a8d8b5996f8d5bd65f36ea37e36d1b89c6063586
font_01_sfnt_off000102a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A8 18144 bytes
SHA-256: eaf683f99cc307f6820e268dd045ce031285984700361fb3916724524c6f516a
font_02_sfnt_off0001327d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1327D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.