Malicious PDF — malware analysis report

Static analysis result for SHA-256 41db9b823364bdc1…

MALICIOUS

PDF

81.4 KB Created: 2021-09-16 18:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 317954e8b8cc724b5824c33eab2f6d81 SHA-1: 7efba6e3b0dace15ce156bcb44a9839f18f8899d SHA-256: 41db9b823364bdc113a99fc4285a0dedd573aad07b96d96843f262a7d5fbf8d7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs pointing to suspicious domains, many of which are structured as link farms or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure strongly indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://infrive.ru/uplcv?utm_term=hotspot+app+for+android PDF link annotation
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/juzafopowufi.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/begekomugedor.pdfIn PDF document text
    • http://africareview.in/userfiles/file/jurinidexuxokezudu.pdfIn PDF document text
    • http://vladekoservis.ru/files/fuwerajovolojevusakigegul.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/fogixoradudiligosim.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/41849888776.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/tekofupidedejifutumiv.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/gekenixuwa.pdfIn PDF document text
    • http://ambartakip.net/belgeler/file/fokalakokoj.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109090054439114.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/9506371176.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f085bb69d0---39128959586.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/vopukadupufuvisegamirevug.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/todiv.pdfIn PDF document text
    • http://0575zl.com/userfiles/file/74637637531.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/bovuzuwigajepajivulozo.pdfIn PDF document text
    • http://eubeer.vn/uploads/files/fewamozakigakipiwigukures.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/kakonom.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/fedonopipifogapidine.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/zoxofokexikaga.pdfIn PDF document text
    • http://salkim.com/userfiles/file/84109245282.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/jezakowovilenidodijenimel.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/maraparabexidifuz.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/zugakinur.pdfIn PDF document text
    • 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_off0000da62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA62 17928 bytes
SHA-256: 0207a08f24b5523116b9552f646f158996fe6da4c5eb67100ad02db8efa87dfc
font_01_sfnt_off000108ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EA 10304 bytes
SHA-256: 5c667240e2ca7b92be78e58b04115439597c41e0bc8c517343be9bc9e05b4772
font_02_sfnt_off00012036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12036 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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