Malicious PDF — malware analysis report

Static analysis result for SHA-256 577a5ec5fa470f5f…

MALICIOUS

PDF

80.6 KB Created: 2021-03-31 00:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: aa852dcde882b79691217945dbf72d3e SHA-1: 55d5f16d7c8b45bca7edb9f5dc69e0b80a7a4d86 SHA-256: 577a5ec5fa470f5f9d47f8d5680fdb96dc13096abc264780ac987fbc9e097545
176 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a phishing lure, disguised as a Budapest metro map. It contains a malformed exploit stream and a large number of external links, many of which point to PDF files, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://nipisod.ru/award?keyword=mapa+metro+budapest+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4477629/normal_603b9ace7baf1.pdfIn PDF document text
    • http://insurancecarusa.com/sky_chart_app_androidck9mt.pdfIn PDF document text
    • https://lupenasax.weebly.com/uploads/1/3/4/7/134738003/puvikizexamaw_fulizitulu_mimojanup.pdfIn PDF document text
    • https://lejuziluzamof.weebly.com/uploads/1/3/4/8/134863123/4660491.pdfIn PDF document text
    • http://cookwellbakewell.com/51086195068k5w10.pdfIn PDF document text
    • https://jasutabaxe.weebly.com/uploads/1/3/0/8/130873915/ragenomagamisu.pdfIn PDF document text
    • https://zuretajobujab.weebly.com/uploads/1/3/1/4/131483148/9964689.pdfIn PDF document text
    • https://jevomijaled.weebly.com/uploads/1/3/1/8/131856338/ead7776.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468827/normal_603fac1925ab6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://18bc7be3-897e-46c1-a475-efc190d089bd.filesusr.com/ugd/62845f_520fa251a624447191f000671a7996dd.pdf?index=trueIn PDF document text
    • https://ff999131-262c-4f46-aa1e-84c50d3d9e43.filesusr.com/ugd/a474dd_2b34fca96b7d4548924f8b04086b3d5f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a437def-1018-419e-b30b-fd17b70c225a/kingdom_manga_643_release_date.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/36394482141.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/best_funds_for_2021_india.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/bomberman_apk_multiplayer.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/your_song_easy_piano_sheet_music_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b593ff18-202a-4b31-a121-e6011662b159/23522330515.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0B 5300 bytes
SHA-256: 998c056663c7ad7d44465d87b596d20d420569153871eeb20c08bd00a075c0e7
font_01_sfnt_off00010ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFB 12084 bytes
SHA-256: a5fe2dc7728739331fbd3722dce7278a6ac15d265f3d94e7738583bbe43d99fa

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