Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e490265474da15e…

MALICIOUS

PDF

78.2 KB Created: 2021-02-12 08:45:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e6eb8370f3d891355856953783ab8fef SHA-1: 73de9e0f37a4e54db575d8b5bbecfb161106e52b SHA-256: 3e490265474da15ef7168c8a1d1224da55dc708c3e19fe21542a93a0ae7fbbf6
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and known malicious redirectors, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a lure to external malicious content.

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 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/wb?keyword=mxf%20video%20converter%20for%20mac%20free In PDF document text
    • http://pizolezevudowep.iblogger.org/guvesuregidexuga.pdfIn PDF document text
    • http://voiprormul.xyz/denimadibidepurjnojy.pdfIn PDF document text
    • https://cdn.sqhk.co/kuxefoxo/g9hghaC/vavewajuguxerebuzama.pdfIn PDF document text
    • https://cdn.sqhk.co/fekawitaxug/hiicii7/58316828912.pdfIn PDF document text
    • http://zinifezabi.iblogger.org/64257008634.pdfIn PDF document text
    • http://tb-films.ru/mikecrack_diamantito_1_2_3d861j.pdfIn PDF document text
    • http://lovumodezubudem.iblogger.org/lutewatap.pdfIn PDF document text
    • http://teaitalis.space/mazebert_td_guide8je4p.pdfIn PDF document text
    • http://ketousa.site/gout_guidelines_australiafdbbp.pdfIn PDF document text
    • https://cdn.sqhk.co/devisofage/idX99ij/19599039269.pdfIn PDF document text
    • https://cdn.sqhk.co/povewepalu/WSgjvYV/anime_3d_live_wallpaper_android.pdfIn PDF document text
    • https://cdn.sqhk.co/vedasukuki/1cieDif/fafedusatibonilira.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447669/normal_6003d26b5f321.pdfIn PDF document text
    • https://cdn.sqhk.co/sotatixorawi/3hehdDP/81258864116.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417145/normal_600278027fd00.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/95185068067.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/nhmrc_australian_guidelines_prevention_control_infection.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/award_bios_flash_utility_dos.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/rozixanipejobezezenitubo.pdfIn PDF document text
    • http://sewasijibakel.epizy.com/formation_chaudronnerie_aronautique.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_off0000f443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF443 5092 bytes
SHA-256: 8e077e172f4aba612e8fbce5400c4cd25ac72cc47d43453255292124aeda7cda
font_01_sfnt_off00010596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10596 11244 bytes
SHA-256: bfa11df6b09e1fa5ce619cb281aa247e40eab83782e2c8ba47b9eac1dadf4a32

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