Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7cd2b4ac49635a1…

MALICIOUS

PDF

74.3 KB Created: 2021-09-21 09:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e229bf81b87bb502034ff3ce15ece23b SHA-1: 0bc6b7c89c5c34059013616e59415150b5dcbe7b SHA-256: b7cd2b4ac49635a135409aa11d3e3fc0923361404f7e7823589ed0a4c8b3c6e1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, strongly suggests a phishing or link-farming attack pattern. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://queure.ru/uplcv?utm_term=bf+shayari+love PDF link annotation
    • http://alfavs.eu/userfiles/file/75834407651.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/kinivosolewagekewanig.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/tawakigikejasefeko.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/sexamirerilataburex.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/sofuzibutum.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/mudusidigevaza.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/lorudogogaxafelawete.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/fafeminaxeti.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/wilozovaziwadoxukab.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/matawaxarub.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/jisaredomegasarixaloxuwi.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/i4eul47oqvdl1k97efaii508uo/37388491321.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/datezegosi.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/74923758339.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/99656754504.pdfIn PDF document text
    • http://potya.com/93575694323.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/74508034813.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/13522672471.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/90121042784.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/99725889937.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/mofakaremogibo.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/3924919778.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/97597143495.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_off0000beb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C9 17632 bytes
SHA-256: 4f93756dd3a9e87d64c3b608c773e79c098a44b612cf3a3da06a196ede312013
font_02_sfnt_off000104b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B4 10344 bytes
SHA-256: 3281e468cd412c7d4f69b93bb559c5905c6edd1d453387fb79fecea617645d73

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