Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca9aa6699e5164aa…

MALICIOUS

PDF

85.3 KB Created: 2021-02-19 23:32:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 658a3208d6d6ea2e02b25128efce2c15 SHA-1: aa521ef5154c5132b0cef11863c0a946241caab9 SHA-256: ca9aa6699e5164aa400c909f4df8eb99c0101a6bf8b26b002e5868f0d698acfb
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. This suggests an attempt to generate traffic or distribute malicious content through a large number of links, some of which are obfuscated with numeric slugs. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://bologen.ru/123?utm_term=korean+alphabet+to+english+alphabet+a-z PDF link annotation
    • https://cdn.sqhk.co/noligigibar/ijcuifb/while_true_learn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366969/normal_5ff71a3b30799.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473375/normal_602b95cecc3fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383791/normal_60192e9b73787.pdfIn PDF document text
    • https://cdn.sqhk.co/setewefasari/FCdidgc/43540396616.pdfIn PDF document text
    • https://lojigimab.weebly.com/uploads/1/3/0/8/130814508/bunemagumove-sonexa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377924/normal_6009f67082df4.pdfIn PDF document text
    • https://cdn.sqhk.co/xoxapivasif/Lgg7Pdc/hockey_player_gifts_keychain.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420432/normal_60103979db0f3.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzirixowev/JihjBja/realm_grinder_builds_2020.pdfIn PDF document text
    • http://optarfes.com/home_office_guide_preventing_illegal_working1rwus.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/gomaxod/cimatron_e11_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/49744455878.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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C4 17264 bytes
SHA-256: 4e38400c6914840c4756f2d4bbb785104569f190158fa443fe5f3d0a376d9202
font_01_sfnt_off000105dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DD 5060 bytes
SHA-256: 8ca2f512648a98a80bbef4b9a3968230a1b43d68637b27f7186f37da40971390
font_02_sfnt_off0001170f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170F 10260 bytes
SHA-256: dbe9d6fc2b84bdd9a4b0b304bec44e093141eb31bcbcb225143816d04f0980f3
font_03_sfnt_off000139f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F9 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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