Malicious PDF — malware analysis report

Static analysis result for SHA-256 84daafb87048d583…

MALICIOUS

PDF

81.8 KB Created: 2021-04-06 22:35:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4db95aebdf5b3dae93e7571b238ca39d SHA-1: 7fa30be638700a5e6f4a3452f7200862516df013 SHA-256: 84daafb87048d583a682418cad288438d8d5065da540a75032168d265d23ab3b
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors, indicating a link farm designed to lead users to potentially harmful content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • 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.
  • 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.
  • 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=sujet+brevet+des+coll%25C3%25A8ges+2020+pdf In PDF document text
    • http://nakijeku.mygamesonline.org/tupigelurutewigikuf.pdfIn PDF document text
    • https://fojevatiseme.weebly.com/uploads/1/3/4/4/134400043/6522817.pdfIn PDF document text
    • https://limuvowefegepud.weebly.com/uploads/1/3/4/5/134509231/7905673.pdfIn PDF document text
    • https://budasanufewe.weebly.com/uploads/1/3/5/3/135323580/7740aedf1ce.pdfIn PDF document text
    • https://cdn.sqhk.co/zonigita/gviizia/heineken_song_asteroids_galaxy_tour.pdfIn PDF document text
    • http://lefejot.22web.org/83447899081.pdfIn PDF document text
    • https://polopiwej.weebly.com/uploads/1/3/4/3/134353222/moginigojewutajama.pdfIn PDF document text
    • https://nupigefaxobabu.weebly.com/uploads/1/3/1/0/131070289/zewuvawasuja_kifizejesabe_sasubapofepi_vatipopoxeb.pdfIn PDF document text
    • https://nuniladolu.weebly.com/uploads/1/3/0/7/130775245/518866.pdfIn PDF document text
    • https://sabazufolitok.weebly.com/uploads/1/3/4/5/134585121/werekerug-sepelubozilejo-bepasexivovo-zinemefutodeti.pdfIn PDF document text
    • http://bupatinewesep.66ghz.com/abacab_tab.pdfIn PDF document text
    • http://wosozage.mypressonline.com/53773044007.pdfIn PDF document text
    • https://cdn.sqhk.co/juvebuzizej/hbBjat6/64195738374.pdfIn PDF document text
    • http://kanaxade.mygamesonline.org/78422735591.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/jdXjc7E/1547097663.pdfIn PDF document text
    • https://cdn.sqhk.co/saboxiwago/ihgdJHv/82152824950.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
    • http://jalijoruki.atwebpages.com/morawimaveda.pdfIn PDF document text
    • http://xovipofeguz.epizy.com/b_w_zeppelin_air_manual.pdfIn PDF document text
    • http://xoxitazowakovit.rf.gd/medical_microbiology_bacteriology.pdfIn PDF document text
    • http://gofosuxubajo.epizy.com/kekowusutukeguz.pdfIn PDF document text
    • http://gukofotogun.epizy.com/sprinkler_irrigation_design.pdfIn PDF document text
    • http://lobulowigewimu.epizy.com/46389738514.pdfIn PDF document text
    • http://lijazujarakowom.epizy.com/pugaketefemoz.pdfIn PDF document text
    • http://pimogajen.epizy.com/58493971440.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_off0000ee83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE83 5636 bytes
SHA-256: 42a3ec141686f07de36fc0b2413eb01109cfead57a3df2a3b18ed2c9107072cb
font_01_sfnt_off00010195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10195 12816 bytes
SHA-256: 5798ebb25caf1ded447a388776f7e5f3207cd5bdb4aa52f393511247d59b68ba
font_02_sfnt_off0001298d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298D 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378