Malicious PDF — malware analysis report

Static analysis result for SHA-256 13c8eb7816dedf28…

MALICIOUS

PDF

98.7 KB Created: 2021-03-23 04:29:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 47c3951250583a6975197f5d3b335993 SHA-1: c83d718def4d15fb589db85271ee52fd6ab99016 SHA-256: 13c8eb7816dedf287345448491b092463eca3c892f04387551d0a4e6a858be02
134 Risk Score

Malware Insights

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

The sample was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains multiple external URIs, including one that appears to be a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of urgency language further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pelibifir.ru/123?utm_term=eau+guidelines+urethral+stricture
    • http://likelid.xyz/developing_the_leader_within_you_summaryhfunm.pdf
    • https://static.s123-cdn-static.com/uploads/4454167/normal_5ffc7e0fae552.pdf
    • http://igafnd.org/how_do_you_write_a_descriptive_narrative_essay_about_yourselfyc4r0.pdf
    • http://reform-st.ru/danabufilerojaputapujepeb7pyy.pdf
    • http://natnat.fun/famezemij53ga.pdf
    • http://wildboost.club/new_english_font_design_freet6fcp.pdf
    • https://cdn-cms.f-static.net/uploads/4477400/normal_6031b78942c00.pdf
    • http://maewallace.com/sunekazugugipebavyozpk.pdf
    • http://cashbackk.site/counter_terror_apk_modo1v4b.pdf
    • http://masajsalonunuz.com/saxanaluxexepixoxefixss3qn.pdf
    • http://naturaitalia.space/22105956708qo1d3.pdf
    • http://sosed.market/jeep_unlimited_wrangler_towing_capacity5jm7e.pdf
    • http://1freedom.space/unlimited_free_vpn_turbo_speed_vpnwfbkf.pdf
    • https://cdn-cms.f-static.net/uploads/4421641/normal_603c44f9afa56.pdf
    • http://interstart.online/nadevtecur.pdf
    • http://arnautmebel.ru/t_maxx_2.5_transmissionjkkuz.pdf
    • http://cz-nitrof.website/98023941769f6x5f.pdf
    • https://cdn-cms.f-static.net/uploads/4462352/normal_601f05555c7f9.pdf
    • http://naturalik.fun/4th_grade_math_worksheets_multi_step_word_problemsygnzq.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_dc71e847f0cd4106913483ae523019ed.pdf?index=true
    • https://e7ba4f66-d023-404d-a355-a5b98970f127.filesusr.com/ugd/cac9e4_92aec54a2e9e4a85ab94e17bcb86e55f.pdf?index=true
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_58e9fef26d084667aaee9e754727c678.pdf?index=true
    • https://73e25548-3913-4bbb-aa69-a1b25f69568d.filesusr.com/ugd/cece23_ad0715feaede45cc97beac1f8a4291e8.pdf?index=true
    • https://03df18d0-0a94-4077-8b44-1f3cf8b7c870.filesusr.com/ugd/23a6c3_3404adee22c84cacb61317cd2ac593d0.pdf?index=true
    • 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_off00014482.bin
d047b3404a5fb823d3e0de63c17fc18fb6be450715d51592c7c650f9f9259708		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14482 5160 bytes
font_01_sfnt_off0001560d.bin
12866afd13f7abd9bc89f292e2949cc041b546977af82d277092842974f35677		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1560D 11648 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.