Malicious PDF — malware analysis report

Static analysis result for SHA-256 f61964aa555c0f6e…

MALICIOUS

PDF

73.1 KB Created: 2021-09-28 22:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c6047d306085110664d40b3072f1a0e8 SHA-1: 04a8357ccb552c03c2218d59a784d29e7f4e719f SHA-256: f61964aa555c0f6ed95cfd60538b23358d57c592bca3ed3cadc0a1e9ca849c17
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external domains, suggesting it functions as a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the PDF for containing many links on disposable hosting, further supporting its role in directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=virtual+space+yr+gaming+apk+download PDF link annotation
    • http://sanmorales.es/userfiles/files/wawidolinaworemasaxepetel.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/xinixigowis.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/39130981552.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/gapuzasefomowujavo.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/53620023602.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/56260899864.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/38084421019.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/letukegedulijak.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152c5eeec5bd---93331522311.pdfIn PDF document text
    • https://cowik.pl/upload/robulomupakar.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/malamowovubivir.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/27229054704.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/613e60faed62d.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/vomatasofomuneponekenolu.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b191c50b58---72876957110.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/6458755082.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/xajurolebep.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/gasiwebapapaveroj.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/56153671886.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/94799002915.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/mezixutunoxajaluriwa.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_off0000b175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB175 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC987 20068 bytes
SHA-256: 711256ff367b87c205933bbe334478d6e41faf227b79d69b8d2374ba16be23fa
font_02_sfnt_off0000fb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB18 11216 bytes
SHA-256: d3b37ec38016e545a85f6611a3821c752a48070a3964de2ae15b18663a617ade

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