Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bd87274ff7f3a77…

MALICIOUS

PDF

81.6 KB Created: 2021-09-09 08:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5dcac2f4a4b7bf967f9df8ad3c4f47cb SHA-1: 024002bd2cc53e68b09532f57d3cf3dcb58a4381 SHA-256: 1bd87274ff7f3a77172fb3a433e2fe154727ddfebc287923e89b93a32b515352
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially malicious domains and are structured to resemble file downloads. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a high likelihood of this document being used for malicious purposes, such as phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns strongly suggest an intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://tungafilm.com/dorceiys/ckfinder/userfiles/files/nozikirepirijomejoge.pdf In PDF document text
    • https://zhavezbozi.cz/data/file/78340823537.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/vexaw.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/zatumadaxekizubofem.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/80358018779.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/57902231744.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161394c7d87beb---78032971138.pdfIn PDF document text
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/filarumimikimewitinepe.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/kulurebiruxomubumimuzebu.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/gusene.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/dukewamomalobelufipexe.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/90434327286.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/45998762843.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/mubopom.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/leterawajejetevabatu.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/66951768871.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/ligugep.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/14489875243.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/161306cfbdb75e---peduvumow.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/kafegofasodagebuzekopuv.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/wozofibivirojenekitemesip.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/34745361678.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/kowenuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=download+commentary+for+fifa+14PDF 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_off0000da65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27C 10800 bytes
SHA-256: 1701a16146149bade7e61e2cab65b4fefe02131aa20f10b973101f5c5f628991
font_02_sfnt_off00010b79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B79 17312 bytes
SHA-256: 6546f1ddfd65d0a1365eb4580ddaec0703653c48a9567d4965a74b1ccfe3cd20