Malicious PDF — malware analysis report

Static analysis result for SHA-256 663415d1984b6bf3…

MALICIOUS

PDF

77.0 KB Created: 2021-05-01 22:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 63fa183e2501f544585231ed686b28f4 SHA-1: 2a59f8830fb8e29d061de425da26b25dc0b0fdd8 SHA-256: 663415d1984b6bf3f7603b9acf4d49a7b4a1763e88c986df581b9557b34f5d97
184 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, appears to contain search-like queries, suggesting a phishing or scam lure. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 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/strik?utm_term=how+much+are+white+air+force+1+at+footlocker In PDF document text
    • https://cdn-cms.f-static.net/uploads/4495707/normal_6058eee905deb.pdfIn PDF document text
    • http://rezltml.xyz/new_guide_pk_xdapowsv.pdfIn PDF document text
    • http://woradegasuma.iblogger.org/how_to_perform_transcendental_meditation.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420244/normal_5ff779802be22.pdfIn PDF document text
    • http://ziwewixowele.sportsontheweb.net/veruwezeso.pdfIn PDF document text
    • http://azakalaza5.xyz/what_does_im_fine_really_meanh09eh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494657/normal_5ff24a6da9aed.pdfIn PDF document text
    • http://tophomework.space/bose_wave_music_system_1vh4uai.pdfIn PDF document text
    • http://xoxanuf.mygamesonline.org/alzheimer_sintomas_y_tratamiento.pdfIn PDF document text
    • http://fimewovoko.getenjoyment.net/82836527193.pdfIn PDF document text
    • http://mastericy-chistoty.ru/dalomubijidovalefarnbwla.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475872/normal_602057f2d1953.pdfIn PDF document text
    • http://netezasodi.22web.org/matura_angielski_poziom_podstawowy.pdfIn PDF document text
    • http://nadozigipak.22web.org/tazupibukabuxusoju.pdfIn PDF document text
    • http://astrology-personal.online/dilegups1my.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ranigaviweriz.epizy.com/dujurifabet.pdfIn PDF document text
    • http://rekewam.rf.gd/amando_a_pablo_odiando_a_escobar.pdfIn PDF document text
    • https://78fa80b2-8629-447b-ad63-53e91e8d4948.filesusr.com/ugd/8f02de_ba01f9d621ac4702b392ab7c2d7b5861.pdf?index=trueIn PDF document text
    • http://meziwadosemuge.epizy.com/xeribalidamezonumeme.pdfIn PDF document text
    • http://nazemuse.epizy.com/afraid_of_virginia_woolf.pdfIn PDF document text
    • http://dizibabazuvuxu.rf.gd/academic_poster_template_publisher.pdfIn PDF document text
    • http://velevemi.epizy.com/cambridge_ielts_listening_test_3_with_answers.pdfIn PDF document text
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_8997f743f37941fcb6eb5fcd9bdea621.pdf?index=trueIn PDF document text
    • http://godosuluto.myartsonline.com/20084583465.pdfIn PDF document text
    • https://aa5f33e9-793b-4807-a257-9eac84d314d0.filesusr.com/ugd/aa57b2_7a636abad256471ab82741a1e34be2c4.pdf?index=trueIn PDF document text
    • https://4a39c6c9-989b-4d11-b2d8-cc0becc7f193.filesusr.com/ugd/ef0078_6321e40df855430b84c9f9e85dbf6f34.pdf?index=trueIn 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_off0000efcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCC 5112 bytes
SHA-256: 6a011a31b9ecd3ceea457683b9b69791ace3f7578bbe6ee0f01cc0c2c43faf14
font_01_sfnt_off0001011e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011E 10752 bytes
SHA-256: 53116f6c56f40ba4042cc40880d2608b88b1c1ca2ac70bd75289cc361fa13f25