Malicious PDF — malware analysis report

Static analysis result for SHA-256 e12b4e616ac79f08…

MALICIOUS

PDF

84.8 KB Created: 2021-03-10 09:56:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 1b09b504a6ea168fe00cdbc003e29522 SHA-1: 28dd92aa319b1cc8fc9e4463a21a8a672569aaa0 SHA-256: e12b4e616ac79f088eb7d83c2aa921148bf82e157e70de304968ea62f2194320
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this sample as malicious. The document body, though heavily obfuscated, appears to be a lure related to winning the lottery, which is a common social engineering tactic. No scripts were extracted, but the presence of malicious redirectors suggests the file is designed to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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+win+the+lottery+in+texas In PDF document text
    • https://cdn.sqhk.co/zepipawetopi/Xx0g2jf/weniradetobifuwafujupo.pdfIn PDF document text
    • http://rawuzexo.iblogger.org/88421478379.pdfIn PDF document text
    • https://navitadewota.weebly.com/uploads/1/3/4/0/134017874/kunasij-dixereme-jizolufigumi-kegen.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379487/normal_5fdf1448f244b.pdfIn PDF document text
    • https://taxufutusa.weebly.com/uploads/1/3/4/5/134514166/bibesurofi_dubomegig_tadoluted.pdfIn PDF document text
    • https://cdn.sqhk.co/pamoguto/ggdtgfI/dvorak_new_world_symphony_violin_sheet_music.pdfIn PDF document text
    • https://werovowota.weebly.com/uploads/1/3/4/7/134766705/825d77266.pdfIn PDF document text
    • http://znalomstvavip.site/12349595075x7zxx.pdfIn PDF document text
    • http://premiumpornclips.com/tesis_de_alcoholismo_en_adolescentes99idc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384323/normal_5ffa791c4d0fb.pdfIn PDF document text
    • https://cdn.sqhk.co/pulazapusaw/gdjaHii/paypoint_mobile_top_up.pdfIn PDF document text
    • https://kerawitoges.weebly.com/uploads/1/3/4/8/134878251/wefimaniretol-jikojaru-wevonatoro-nidoj.pdfIn PDF document text
    • http://kuvofejom.iblogger.org/autocad_2020_mac_download_student.pdfIn PDF document text
    • https://cdn.sqhk.co/famuxina/ic6jfY9/f1_mobile_racing_hints_and_tips.pdfIn PDF document text
    • https://rolavakewuxilo.weebly.com/uploads/1/3/1/4/131407047/5729220.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://dosevidi.rf.gd/jeffersontown_police_reports.pdfIn PDF document text
    • http://vumebef.epizy.com/minority_report_summary_sparknotes.pdfIn PDF document text
    • http://vedalutepex.rf.gd/72162111235.pdfIn PDF document text
    • http://xofenilar.epizy.com/977409103.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED63 4784 bytes
SHA-256: 38e488b7e88e7fafbcd26194cf992ff93026387bf1e9bcaab41a820538377160
font_01_sfnt_off0000fda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA1 10764 bytes
SHA-256: d31431554c4f7920970528fad19d812d877b8900da4fd81c94331c3cdc21e875
font_02_sfnt_off000122a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A8 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90
font_03_sfnt_off0001373f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1373F 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378