Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7464fb22af80f69…

MALICIOUS

PDF

74.0 KB Created: 2021-02-16 18:12:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 39f0d08b0c1548cf0267e8dcf7938ca7 SHA-1: 83ccab1843e0e1ad2a3dc401b774e489fcbed897 SHA-256: d7464fb22af80f69d08a5e4712dcd596587bff08a6c96a907a18ccf3928cf800
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, specifically `https://crophysi.ru/strik?utm_term=how+to+fix+a+squeaky+frigidaire+affinity+dryer`. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body, though heavily obfuscated, appears to be a lure related to appliance repair, aiming to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://crophysi.ru/strik?utm_term=how+to+fix+a+squeaky+frigidaire+affinity+dryer In PDF document text
    • https://static.s123-cdn-static.com/uploads/4481993/normal_5ffcf8376ed2f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369331/normal_5fdf1199f26ff.pdfIn PDF document text
    • http://jevopapivixepe.iblogger.org/rizavigidizumaraxawejoraw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404497/normal_6019dbd54c09c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418579/normal_6014fff67a00b.pdfIn PDF document text
    • https://dobivevoxopu.weebly.com/uploads/1/3/1/4/131453544/3a7f8ca7119b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365608/normal_5ffebf3b83fab.pdfIn PDF document text
    • https://jigudubexafodi.weebly.com/uploads/1/3/0/7/130738940/adaa3d0.pdfIn PDF document text
    • https://vogoworelo.weebly.com/uploads/1/3/4/2/134266182/lovorajevi-xesogibuwininu-piwif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415068/normal_601073adb4542.pdfIn PDF document text
    • https://kewojuposadut.weebly.com/uploads/1/3/4/3/134374438/zejofologodekanu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427538/normal_601f32e256463.pdfIn PDF document text
    • http://vasowenotaruso.22web.org/kojirudapunawu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383586/normal_5ff8c442d68bd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://refofigeto.epizy.com/bujibojubima.pdfIn PDF document text
    • http://puwomuf.rf.gd/balun_balun_dada_video_song.pdfIn PDF document text
    • http://sisigetevi.rf.gd/67018507298.pdfIn PDF document text
    • http://pukokudew.epizy.com/avatar_game_ios.pdfIn PDF document text
    • http://tikarere.epizy.com/pemebozigutewu.pdfIn PDF document text
    • http://japorivexasore.epizy.com/fast_nds_emulator_free_for_android.pdfIn PDF document text
    • http://xumomevafuvozup.rf.gd/auditoria_de_sistemas_vs_auditoria_informatica.pdfIn PDF document text
    • http://rufazigivemebod.rf.gd/donivosekedapesapexom.pdfIn PDF document text
    • http://sotatelovutegep.epizy.com/fools_garden_innocence.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_off0000e431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE431 5456 bytes
SHA-256: 6f405e0b0c9acec76593d76a712b7045da39f9169ce94fe779d3ec728c6e5674
font_01_sfnt_off0000f6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EA 10412 bytes
SHA-256: 08e3a69c1ddee51f90b4e83210c12f829b3ac15062c7c353e3604d2a995b3120