Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0a67d570d0264e4…

MALICIOUS

PDF

76.2 KB Created: 2021-09-17 17:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3aaa2a6a1e1be4c513f3aad858516db7 SHA-1: 0573e5334538613e3ac6f2c0b73e053484f2ccc3 SHA-256: a0a67d570d0264e46bc19f9ba66cec822f60b6e6ab3f68f4d7d9d5da78314e11
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. The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit vulnerabilities or redirect users to malicious sites.

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
  • 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://poulinstrapscan.com/userfiles/file/63652524802.pdf In PDF document text
    • http://epilia.com/upload/FCKEditorfile/weruzasalubakujosas.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403bd894f04---bimewewinigekuji.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/70857377770.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/30162270061.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/39038705749.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/50378163731.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/53770527104.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613946bec478e---raduginimazajoredobogi.pdfIn PDF document text
    • http://rubella2.integra-sh.com/userfiles/file/nazefe.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/lamubadewevino.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/mumokeludel.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/momugipi.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/tujonibulimo.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/wuzibojubebofegaduwuda.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/sofepenaw.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/76628411319.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210912_FFAEBA3BD0466EF8.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/wowegifok.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/zowolano.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/bilapeviwedemuve.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/33295321894.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/ropuzunutonajunavubu.pdfIn PDF document text
    • http://normel.org/files/upload/file/95104092597.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=prem+amar+full+moviePDF 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_off0000c5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF7 17904 bytes
SHA-256: 5f843d773829e359a6d8e359cf02862d8f5436eeef48b3bbb08d0adb64243144
font_02_sfnt_off00010cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF3 10172 bytes
SHA-256: 19fab2cfbc835d26b07b02bade693f4828867d83b285e05ad1dad392367ed560