Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea1898f62ea68d5d…

MALICIOUS

PDF

77.3 KB Created: 2021-03-15 21:12:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e002c38327c73c331dc787c9c0a2a64 SHA-1: 1ef07c4ad1e084344e28c636aae0366ab873cf1f SHA-256: ea1898f62ea68d5d52fb21c68352bc77aa9cb6c704dc95c803701e35d237660d
164 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing lure, specifically using an invoice theme. It embeds numerous external links, with one prominent URL being `https://seumenha.ru/award?keyword=car+repair+invoice+pdf`. While no scripts were directly extracted, the presence of multiple external links and the phishing lure suggest the document is designed to redirect users to malicious sites or download further payloads. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://seumenha.ru/award?keyword=car+repair+invoice+pdf
    • https://cdn.sqhk.co/pugepavofu/jSkhgia/badofoxufekekanazobulupa.pdf
    • https://fubupudixad.weebly.com/uploads/1/3/4/7/134742266/sexefamikiwuwuj-telilived-natonodidasu.pdf
    • https://cdn.sqhk.co/kavejufa/djcgeKO/litanotujuxazitun.pdf
    • https://vixugusimuxomuj.weebly.com/uploads/1/3/0/9/130969476/kajiziwo.pdf
    • http://want-seo.ru/84825571581hmhxb.pdf
    • http://7lessons.website/kenmore_he2_plus_drain_pump_part_numberinmr7.pdf
    • https://cdn.sqhk.co/netimawifes/iht4AxG/giwopuj.pdf
    • https://cdn.sqhk.co/vuzowadijavu/aihd1he/500_words_2021.pdf
    • https://cdn.sqhk.co/rovujesox/kghQgf1/ranupek.pdf
    • http://begemotiks.fun/19085388197hvy39.pdf
    • https://cdn.sqhk.co/fumodolanes/jhin7jd/ugandan_love_songs_nonstop.pdf
    • https://dodukitomot.weebly.com/uploads/1/3/1/4/131407143/8157390.pdf
    • http://notapeb.iblogger.org/congruent_triangles_questions_and_answers.pdf
    • https://cdn.sqhk.co/dagorabowixu/hicZidr/us_national_parks_service_jobs.pdf
    • http://gk-kuban.ru/writing_inequalities_worksheet_6th_gradeqlvf1.pdf
    • http://busforpay.online/mabewatowezathpsbj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://63a0a607-6d1b-4b95-a813-f1b07cabc719.filesusr.com/ugd/ad56f2_e83e12d0c4f24226b2d3be17ccde52a1.pdf?index=true
    • http://wesozavo.epizy.com/how_do_i_start_keto_diet.pdf
    • http://nokonasaxe.epizy.com/algebra_1_math_answers.pdf
    • http://vevemaj.rf.gd/el_rey_del_tomate_pelicula_completa_online.pdf
    • https://849bdae7-2456-4570-9e2a-fc769e7e49ad.filesusr.com/ugd/2074c9_492db4df4907432894a89fc49feb8131.pdf?index=true
    • http://jatomije.rf.gd/multiplying_and_dividing_integers_worksheets_7th_grade.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_off0000f1e9.bin
5483e4b3cd6233f88ff148840d9b2bcaefddc9c1aa61a15f080aeb2ad35ae5ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E9 4904 bytes
font_01_sfnt_off000102ae.bin
ce4a03d701555d21154871d141768b25026a9502c3e08990db235cb7ca40c286		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102AE 11016 bytes

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