Malicious PDF — malware analysis report

Static analysis result for SHA-256 528c6957b2e51e49…

MALICIOUS

PDF

69.4 KB Created: 2021-02-15 06:59:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 2388e5f4ce1353a2cbb7f92959377f50 SHA-1: 18f071de37d39896641ab5ac169611679b11ddcb SHA-256: 528c6957b2e51e4998440880f7b11601b3a6d5f8c41b74e6493b0ab30602bb67
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains an external URI pointing to 'seumenha.ru' which is presented as a download link, aligning with a phishing or social engineering attack. The document body, though heavily obfuscated, contains text related to a 'text generator apk download', further supporting the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://seumenha.ru/wix?keyword=cool+fancy+text+generator+apk+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4444117/normal_60114913b969f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489843/normal_5ff1cf19782c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488092/normal_5ff079500f2d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414864/normal_601c5d4b46939.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450247/normal_5fe03fb5030a5.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
    • http://tipixerokofor.epizy.com/banijitawefazak.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/54434027441.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/chevron_moustache_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/silk_screen_photo_emulsion_sheets.pdfIn PDF document text
    • http://golujaxi.epizy.com/bajrang_dal_dj_song_ringtone.pdfIn PDF document text
    • http://lugotimasowe.epizy.com/61351344521.pdfIn PDF document text
    • http://bilunijo.epizy.com/54176034765.pdfIn PDF document text
    • http://dewelimu.epizy.com/5041245.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC560 5232 bytes
SHA-256: dc63b92f1f5bf57543e999e7e116a62bdad31792fab54e369f805f7236cb3aaa
font_01_sfnt_off0000d761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD761 10324 bytes
SHA-256: b0479aa35ff07e62b23da65d6a0531b9a78008605c6fe55008cdb124df718500
font_02_sfnt_off0000fabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABC 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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