Malicious PDF — malware analysis report

Static analysis result for SHA-256 b389fda726fb2af7…

MALICIOUS

PDF

76.0 KB Created: 2021-03-18 20:57:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: de50855bf12014c3affcb8637874e171 SHA-1: b21a446b060babebc286115165eb6e6cc2652266 SHA-256: b389fda726fb2af7ac756391a97471bbcafc1f131edb69a078d9392b96c6df6d
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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
  • 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://resalured.ru/wix?keyword=a+practical+guide+to+media+law+milo+stein+pdf PDF link annotation
    • http://haifaiv.ru/blacks_law_dictionary_fifth_edition691q3.pdfIn PDF document text
    • http://vseti.life/ragifagezolobobeggk74g.pdfIn PDF document text
    • https://wamurereleveti.weebly.com/uploads/1/3/5/3/135392703/megelo_sabosuvali_ropexasa.pdfIn PDF document text
    • http://hurleyshamburgers.com/vikezubugalutaxibor4cfrp.pdfIn PDF document text
    • http://fudopajir.iblogger.org/rulokafisulurasupo.pdfIn PDF document text
    • http://fupomogusi.22web.org/54771759133.pdfIn PDF document text
    • https://tuvepovuno.weebly.com/uploads/1/3/3/9/133997374/zopaxeraj.pdfIn PDF document text
    • http://naturfresh.space/fuzofosanilethcobr.pdfIn PDF document text
    • http://bekotuselol.22web.org/who_sang_the_bluest_eyes_in_texas.pdfIn PDF document text
    • https://sowibize.weebly.com/uploads/1/3/5/3/135348762/a9afee78.pdfIn PDF document text
    • https://laboxowoxom.weebly.com/uploads/1/3/5/4/135400847/0e02e3740.pdfIn PDF document text
    • http://busumewum.22web.org/fosojapam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://665985ba-8e9f-4173-b993-17a3090d61d7.filesusr.com/ugd/08421c_98f5d870f49b4b04bee83572ce7f183e.pdf?index=trueIn PDF document text
    • https://e1ca4115-fb55-43f9-84f1-eaf814f8c83f.filesusr.com/ugd/18122d_ac3e0aea270c4da287c055963272bfe9.pdf?index=trueIn PDF document text
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_90aa6e8afc724117a67aae32a61bb2d3.pdf?index=trueIn PDF document text
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_6274d0f5faa54f5b86468f995b22f266.pdf?index=trueIn PDF document text
    • https://d86ad34a-7df2-4f47-937b-a12ab5abc0fa.filesusr.com/ugd/8cbfce_f56cb01486234ca08798bb5f5d13d0cb.pdf?index=trueIn PDF document text
    • http://fobifuv.epizy.com/96657447965.pdfIn PDF document text
    • http://peromur.epizy.com/pumusava.pdfIn PDF document text
    • http://fonojuw.epizy.com/81495601267.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_off0000e9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FF 5556 bytes
SHA-256: 7f2d3ca0e17d6503c23adf5148774aa9a05cc8c5438cc86132ed46f2128618e3
font_01_sfnt_off0000fcdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDB 11108 bytes
SHA-256: 9841977ad6edf11fb5647be564cd8902284af645879979e07e3f1fd10bab74d2

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