Malicious PDF — malware analysis report

Static analysis result for SHA-256 f11ae327723bcb32…

MALICIOUS

PDF

81.9 KB Created: 2021-09-20 12:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 61141aab2bf3e563b8d77f7eaf642240 SHA-1: 100ace3d2a5d1df003d550b87cd6807f53dbbeb8 SHA-256: f11ae327723bcb32b38c7f72c5320bf728eba5a31dd788486ac2e0a66015ecfa
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links hosted on disposable domains and a deceptive download button, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of an attempt to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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://kcharp.com/ckfinder/userfiles/files/40356579528.pdf In PDF document text
    • http://stevis.cz/files/file/16697886519.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/44430359704.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/55014146374.pdfIn PDF document text
    • http://pjzhengwang.com/upload/file/20210911_103538_175.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613d058f468ab---puxarepofo.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/xulegagifi.pdfIn PDF document text
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/pexidixeguruk.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/abfada6de52936a46b802cf3aa81d0d1/zarividoxexa.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/rimikena.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/larerigotax.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/lajujuxatofebivawawalu.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/17140536695.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/guvirev.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///bezojiri.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/69598266449.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/xofogukedebapulalikafok.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/lopukafiwewod.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/sosogutudim.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/16609004869.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/58161932339.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/26915580699.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/28229570464.pdfIn PDF document text
    • http://registermycompany.in/admin/userfiles/file/dadunatag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=android+record+voice+memoPDF 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_off0000dd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD61 10104 bytes
SHA-256: c1bbf9a8b0b693c363e6a00ee8c4a63e6a8f79d6c8d7f2ba2276cb6d3e2cf9f1
font_01_sfnt_off0000f3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DA 17692 bytes
SHA-256: d100602dc049487b586f50c3a9347f967405d522c48d3554f1bed11491d77e4d
font_02_sfnt_off000121c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1