Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c71c127fb31363c…

MALICIOUS

PDF

91.9 KB Created: 2021-02-17 02:59:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 6f9a1024dadcc35ff478ba1b966082e4 SHA-1: 81d7c62ecdb10245504864d42ea7af34978677e3 SHA-256: 7c71c127fb31363c8c309116609f3c5356783da29f7ee4a06bca532b3f5c0875
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' heuristic and ClamAV detection. The primary URL, 'https://seumenha.ru/aws?utm_term=what+is+comparative+religion+pdf', suggests a lure to disguise the malicious intent. While no scripts were explicitly extracted, the presence of numerous external links and the ML classifier's high confidence score indicate a strong likelihood of malicious activity, such as downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://seumenha.ru/aws?utm_term=what+is+comparative+religion+pdf PDF link annotation
    • https://cdn.sqhk.co/jesotipo/ecjbhjP/jetofizusa.pdfIn PDF document text
    • https://suviliter.weebly.com/uploads/1/3/1/4/131453542/27fb9b6e1a47d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379491/normal_600ce9e640b50.pdfIn PDF document text
    • http://tekeriset.iblogger.org/paxiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380531/normal_600deb0006c36.pdfIn PDF document text
    • https://cdn.sqhk.co/bawusipa/XsjighC/83961276490.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369189/normal_600654898f7bd.pdfIn PDF document text
    • https://bisatabezuniv.weebly.com/uploads/1/3/1/3/131398333/2118669.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464070/normal_601b142cdf935.pdfIn PDF document text
    • https://tivelagazevuw.weebly.com/uploads/1/3/4/1/134131505/faabef1f73109f.pdfIn PDF document text
    • https://kobokudebixisog.weebly.com/uploads/1/3/5/3/135390699/9c3d82ea0dd7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/ain_t_your_mama_song_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/jingle_bells_flute_duet_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/erasmus_school_of_economics_course_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/barbie_logo_wallpaper.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/63289540455.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/nazapubanesurepi.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/new_version_of_whatsapp_plus.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001015a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015A 5432 bytes
SHA-256: 018b36f3ef24c9e0fea44812ceeece5d8aaea23ebb61d055ffd3fdfad6c040c8
font_01_sfnt_off000113ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BA 13276 bytes
SHA-256: b282f0d23f93d795dae9b26830326ae6e56ddf1544fab83e33aaef47190db15e
font_02_sfnt_off00013dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD3 16344 bytes
SHA-256: 73449f9af787c9cf55dcfca576315a6f01e3732db1880f7be94becb9c9291da4
font_03_sfnt_off000153ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153BA 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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