Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e9803651bcbd3a2…

MALICIOUS

PDF

79.8 KB Created: 2021-03-11 00:13:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 506d65ac2bf7a5a7a860d96307a91241 SHA-1: 2d23f337a3785473826c1aa017b4b4d12f93ba90 SHA-256: 1e9803651bcbd3a27a5b561a650c6e07034852375ecea8bd0b9ac86b1f1d472a
176 Risk Score

Malware Insights

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

The PDF contains a high number of external links, many of which are generated for SEO purposes, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and the presence of malformed exploit streams point towards exploitation or redirection to malicious sites.

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://druttle.ru/123?utm_term=curly+brace+in+string.+format+c%2523 PDF link annotation
    • http://ver-alex.website/krups_ice_cream_maker_partsbm5i1.pdfIn PDF document text
    • http://wersita.fun/adidas_yeezy_500_utility_black_restock_datefmggd.pdfIn PDF document text
    • https://sejexogubason.weebly.com/uploads/1/3/1/0/131070030/9726d0dccde.pdfIn PDF document text
    • https://puwaxitakobesod.weebly.com/uploads/1/3/4/1/134109073/f3b96.pdfIn PDF document text
    • https://puraxexi.weebly.com/uploads/1/3/4/7/134718411/1f47348ffcc4.pdfIn PDF document text
    • https://vawotitalu.weebly.com/uploads/1/3/2/7/132710714/dujetakasefokare.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://680e7e7f-99bb-4309-8a01-ecc910dc7690.filesusr.com/ugd/717a42_e84ac7d232ad41d3829710ed8517ea07.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/reportar_telefono_robado_claro_el_salvador.pdfIn PDF document text
    • https://a001dc82-f31e-4944-9b76-0a8e602b6855.filesusr.com/ugd/e4ee87_ce64818d97624fdebed562bec7cf3d4a.pdf?index=trueIn PDF document text
    • https://8a5a474a-a671-4857-921d-d1df0ee72544.filesusr.com/ugd/523716_342f3c9401834fba9ebea2e9afd92659.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/vetiropolabewuz.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/82498126603.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/bradford_hill_criteria_for_causation.pdfIn PDF document text
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_ec67d43564f84c41ba079b173bb81722.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/golepe/pivavejoniminak.pdfIn PDF document text
    • https://dce579ed-4708-43c3-aaeb-2c76a6268d78.filesusr.com/ugd/944939_defd8e72c9f74c7f85bbac1528dd1a1c.pdf?index=trueIn PDF document text
    • https://fc060a1e-8c1d-4b7d-bafd-75f79d4c6355.filesusr.com/ugd/c0a468_b8183cc0577345c7bcff50273256b158.pdf?index=trueIn PDF document text
    • https://74269c25-1731-4359-90d4-804f54ef9c1c.filesusr.com/ugd/b5973a_8b726e0898c748c2aff90abb954fffde.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fosawef/lagu_dj_cendol_dawet.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_off0000eafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFC 5380 bytes
SHA-256: aa3fda3a5a746ad9a7df9dc9afe6fbadeb5fd66d7864a5ddfb7ff7ff77cdc442
font_01_sfnt_off0000fd3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3F 12240 bytes
SHA-256: 28bfd104082999d245c196d6fea6e9798f69133110d853c897f6949f40ceca80
font_02_sfnt_off00012435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12435 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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