Malicious PDF — malware analysis report

Static analysis result for SHA-256 57018fe7eee899a0…

MALICIOUS

PDF

91.5 KB Created: 2021-03-09 04:34:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: bf4a7921e6781b0ba3e24e882ba44406 SHA-1: 4db76e64a31965c46a967cbc8d8ca680b5ecda53 SHA-256: 57018fe7eee899a09430d55fc7e1b6dceabcaf6ebd34326cf33507cfbbc8325f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable hosting and potentially malicious domains, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is part of a link farm designed to obscure malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the ML classification point towards malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8529

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://gimoguvi.ru/award?keyword=reglas+del+basquetbol+pdf+2020 PDF link annotation
    • https://bozuwosumexoxal.weebly.com/uploads/1/3/2/6/132682772/624722.pdfIn PDF document text
    • https://cdn.sqhk.co/fitamorigob/T6Yibii/gameboy_micro_for_sale.pdfIn PDF document text
    • http://hookup154.online/pelofanoehtlv.pdfIn PDF document text
    • http://carishr.com/78061011119ymmvc.pdfIn PDF document text
    • http://itwow.info/divine_comedy_purgatoriot8n6r.pdfIn PDF document text
    • https://nodarato.weebly.com/uploads/1/3/4/4/134487471/nomufes_manituta.pdfIn PDF document text
    • http://tublitalia.fun/rewogiwomuzetukajap50na.pdfIn PDF document text
    • https://bekodezu.weebly.com/uploads/1/3/1/8/131856725/74a0229bb8e3.pdfIn PDF document text
    • http://vashe-zdorovie.xyz/lupawufixagojojojal6am4j.pdfIn PDF document text
    • https://cdn.sqhk.co/jagojixego/g5hjGji/battle_angel_alita_last_order_omnibus_6.pdfIn PDF document text
    • https://cdn.sqhk.co/fajoliteve/hdPjcd5/12066360720.pdfIn PDF document text
    • https://cdn.sqhk.co/pugudanirav/kPicjb1/jomol.pdfIn PDF document text
    • http://snail-case.store/36255086438qv5va.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizilo/0gsIgc1/31848505912.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/cerebellum_structure_and_function.pdfIn PDF document text
    • https://3f735f5a-cd1c-4288-bd93-adeff6e084d9.filesusr.com/ugd/bcc0e4_fca7579147ab4006bbdf42d70c5b604e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gomakobez/kant_what_is_enlightenment_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/dabatisew/sogaz.pdfIn 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_off00012376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12376 5660 bytes
SHA-256: fbb1571eb23c3e1932cc343fc894dadb7d8053a50664d45ccbe6ac3328839b15
font_01_sfnt_off000136bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136BF 4272 bytes
SHA-256: ba22b46157a991826f42df1086683e9697fe9d5070eba8371220c2bfca0eaff1
font_02_sfnt_off00014664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14664 11808 bytes
SHA-256: e78b1339a14bed1767740c759ca6088158fe3fe97e154bbd7b8b5c772acfbd27

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