Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b7cd93e529b928c…

MALICIOUS

PDF

82.3 KB Created: 2021-02-27 19:07:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 702d644ff1aa4100a3d08ebbe4037e94 SHA-1: bc35e44ce5b03835d6a214595faac85e83ade2c6 SHA-256: 9b7cd93e529b928cb64b344caacda2789bd220257cf1a31bc52b3f7467d03b64
184 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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=brother+ce-5000prw+power+cord In PDF document text
    • http://dawexefif.getenjoyment.net/zujujurokexixa.pdfIn PDF document text
    • http://zefujixa.mywebcommunity.org/dirorugezupak.pdfIn PDF document text
    • http://tefitagesev.mypressonline.com/35553200018.pdfIn PDF document text
    • https://siselujasukoju.weebly.com/uploads/1/3/0/9/130969984/1352838.pdfIn PDF document text
    • http://xitabijasava.getenjoyment.net/i_got_peace_like_a_river_ukulele_chords.pdfIn PDF document text
    • http://tobufupevujuma.mygamesonline.org/taurus_millennium_pt111_g2_size.pdfIn PDF document text
    • http://tuderoba.getenjoyment.net/13642655946.pdfIn PDF document text
    • http://nazorizuz.medianewsonline.com/63061988771.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/fomudebipefasu/getting_blood_out_of_white_bed_sheets.pdfIn PDF document text
    • http://rajimorix.rf.gd/how_much_do_med_surg_travel_nurses_make.pdfIn PDF document text
    • http://mulozeraxepe.epizy.com/driver_booster_full_free.pdfIn PDF document text
    • http://zugosixefi.epizy.com/benzene_reactions_worksheet.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_off0000e322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE322 2960 bytes
SHA-256: a31aedb3fe800cd2b5c0120397ec9570e12c7cc97febb81e3d6171160c50e6bc
font_01_sfnt_off0000eda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA4 5180 bytes
SHA-256: 765d21d2661962bf6a19798828a21482dfeaa64f8753327c88af5127d60cba84
font_02_sfnt_off0000ff62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF62 11748 bytes
SHA-256: 29060d735b9df99a1348bc0f38b21fe5e625085ac3ff0d8c5caed3e893f8f973
font_03_sfnt_off000126bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BF 16140 bytes
SHA-256: 3f83bbfb2e03141a9083badfb1da6e2b1773f9aa6b1ed8f30fc2d392a5ee3553