Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a22faf3d9f6459f…

MALICIOUS

PDF

73.7 KB Created: 2021-04-10 16:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 957c2e79e864f58d3ea8d71d3f10dfc0 SHA-1: d1aedc213f50210984b00ecf130bb20aa9103c3d SHA-256: 3a22faf3d9f6459fed940c88c594a7ccbbecc39f2b6f92648050809784deff87
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on Weebly and appear to be part of a link farm designed to obscure the true malicious destination. The document body, though heavily corrupted, suggests a lure related to modem setup, which is a common tactic for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://dafemum.ru/strik?utm_term=how+do+i+setup+my+arris+modem+without+a+computer
    • https://winilogixibofop.weebly.com/uploads/1/3/1/4/131408061/ce02c3aaee.pdf
    • https://zagumukukawikam.weebly.com/uploads/1/3/4/6/134608037/fadujofenaxezom_feborivamiki_xilexoduteg.pdf
    • https://gamajebijapam.weebly.com/uploads/1/3/1/8/131856653/gowuvovowub_mapes_sakonekukonima_zomafuz.pdf
    • https://zopizegojuv.weebly.com/uploads/1/3/1/3/131380511/balivakusebujov.pdf
    • https://bativizamazon.weebly.com/uploads/1/3/4/7/134770744/cd5e4c.pdf
    • https://cdn.sqhk.co/zaviresodew/9E2jfhc/24943918322.pdf
    • https://lasebotoxuxuxir.weebly.com/uploads/1/3/4/7/134729765/fadelonaj.pdf
    • https://cdn.sqhk.co/reditifotep/bGiiyhb/pulse_amplitude_modulation_using_555_timer.pdf
    • https://cdn.sqhk.co/subetudagoli/eb8CD5J/domino_s_carryout_specials_akron.pdf
    • https://datugabow.weebly.com/uploads/1/3/4/7/134745554/2ff06efc350de.pdf
    • http://sinagitozuram.22web.org/ahirani_tadka_mashup_part_4.pdf
    • https://pawawejovotete.weebly.com/uploads/1/3/2/8/132814611/benopejakimusukasoz.pdf
    • https://cdn.sqhk.co/puruwedisuma/1ifhhie/43182272117.pdf
    • https://jofanota.weebly.com/uploads/1/3/2/3/132302765/niguxuvur_rexin_momubuvimobi_wabapigujumegek.pdf
    • https://revewodozuxun.weebly.com/uploads/1/3/1/3/131398596/kowifi_relogikosu.pdf
    • https://cdn.sqhk.co/zoluxoni/hdNhbU6/download_zgirls_2_mod_apk_unlimited_diamond.pdf
    • https://cdn.sqhk.co/fogibadeku/eGXvifO/73323015215.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jazoxuxorilule.epizy.com/paulk_compact_workbench.pdf
    • http://tuwemipidepu.epizy.com/60284596900.pdf
    • http://murarefap.epizy.com/automobile_engineering_ebook.pdf
    • http://puwomuf.rf.gd/how_to_reset_my_singtel_voicemail_pin.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e32f.bin
c532a2f83eeab7bbb97f3dd0fe1c70063f2217fe30b33fcbac984e25e8fe0a26		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE32F 5436 bytes
font_01_sfnt_off0000f597.bin
c73b298c2ad7a1068c1930b347641f8a3a735bcc28fb62297ded8e2000830377		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF597 10484 bytes

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