Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d8749bde7d39984…

MALICIOUS

PDF

74.0 KB Created: 2021-03-06 13:31:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: f584f89aa5e012ac72df94dbf95d424a SHA-1: 7c44faf2a25eb78e9bd8138bc6064ef2127862b9 SHA-256: 6d8749bde7d3998417bbe1c3ef15c3d4280151c1f96b54bde22f91a1eae3d97b
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to host numerous SEO-optimized PDF documents. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=firmware+dd-wrt+no+roteador+linksys+wrt54g+v8 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4481516/normal_603d89704ee67.pdfIn PDF document text
    • http://kowolodevavafiv.iblogger.org/65569853624.pdfIn PDF document text
    • http://geguxejap.22web.org/acog_pap_smear_guidelines_pregnancy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416514/normal_603b4c65908cd.pdfIn PDF document text
    • https://neletataw.weebly.com/uploads/1/3/1/3/131398134/8223033.pdfIn PDF document text
    • https://xojurumute.weebly.com/uploads/1/3/5/3/135328527/0ca76ea2.pdfIn PDF document text
    • https://naroxelilokatud.weebly.com/uploads/1/3/1/3/131384214/kebakurek-rafurukup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lepetape.epizy.com/how_to_replace_battery_htc_one_m8.pdfIn PDF document text
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_afa2beb6e1e74b2fb768042d7db31d36.pdf?index=trueIn PDF document text
    • http://tokavasetalan.epizy.com/endorsement_letter_format_deped.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/hp_officejet_pro_8600_plus_driver_mac.pdfIn PDF document text
    • https://ba85394b-11ac-4ca4-926b-74ca936c52e1.filesusr.com/ugd/5ccfc8_7aca5406639b49139013922ad3639815.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/41768562007.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/livro_vidas_secas_ler_online.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/bbc_urdu_news_app.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/55045604037.pdfIn PDF document text
    • https://bcd7deca-fd5d-492b-a220-d373ca515bc9.filesusr.com/ugd/12f4eb_e17b803e3c4f437fba98e6d1d0f7df24.pdf?index=trueIn PDF document text
    • https://fd7a53fe-11c1-4e60-83ad-ac1bb997268f.filesusr.com/ugd/5cf23b_05fa54d6bdca497a81f4fe47c1f2880b.pdf?index=trueIn PDF document text
    • http://dodemupisam.epizy.com/anand_movie_song_webmusic.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_off0000e127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE127 5856 bytes
SHA-256: 44fc32450da025a601fd43b3068e08f2bc6fc19ab0cfd55217fb01a6e691b31e
font_01_sfnt_off0000f52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52C 11636 bytes
SHA-256: 2bb3120c06e8e69d69b4e0fbcd33d97e4bf6a39c578d211c2abf7974d843962f

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