Malicious PDF — malware analysis report

Static analysis result for SHA-256 a95984532768ef62…

MALICIOUS

PDF

87.3 KB Created: 2021-03-28 15:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c5ea890c0840cd78cf86695472e06abd SHA-1: e022cea46fe98617a52b24bf40840621686eb306 SHA-256: a95984532768ef62b0e70338663326219daffafb2ab806d3b239d6d16d1fe9eb
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with attempts to redirect users to malicious sites.

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
  • 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.
  • 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://jottigo.ru/strik?utm_term=sonic+nutrition+tater+tots PDF link annotation
    • http://easterthjg.com/13241546091l05ee.pdfIn PDF document text
    • http://faponabon.mygamesonline.org/cours_sur_l_aviculture.pdfIn PDF document text
    • http://proita.fun/liwiwopoguronanokadonz055.pdfIn PDF document text
    • http://raponikidosal.getenjoyment.net/referat_anemia_defisiensi_besi_pada_anak.pdfIn PDF document text
    • http://oneitshop.info/how_much_is_samsung_a10_in_usfguu1.pdfIn PDF document text
    • http://dipugipedanam.sportsontheweb.net/gesudabasi.pdfIn PDF document text
    • http://card2card.live/guroxirisujuzowocxuw9.pdfIn PDF document text
    • http://lotsmen.com/gotajakc084y.pdfIn PDF document text
    • http://fefiwizam.sportsontheweb.net/how_to_refill_a_dymo_letratag.pdfIn PDF document text
    • http://sugameloxufe.mywebcommunity.org/english_literature_online_courses_in_india.pdfIn PDF document text
    • http://sitonuba.mypressonline.com/12074718310.pdfIn PDF document text
    • http://opsnatur.fun/cisco_c190_datasheeth7n9v.pdfIn PDF document text
    • http://comforfemj.fun/lamujucy85r.pdfIn PDF document text
    • http://artrosil.xyz/the_challenge_inferno_3_where_to_watchpclps.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7744109e-7749-449a-9a66-8484ae1c3532/fukirujuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/589aebc7-e4f6-4188-99a6-ee3b1c8b5983/how_do_i_change_the_time_on_my_pebble_watch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14e7c140-5747-42a5-9e40-b4567a4b2f29/how_many_calories_in_boston_market_chicken_thigh.pdfIn PDF document text
    • http://roxujewov.myartsonline.com/969863665.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5ac6554-b5d5-4604-8690-136df3b3229e/furubofejexipozabipusiro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccfc5080-dc64-476f-b33d-7dd02fe9d810/laptop_acer_aspire_one_windows_10_s.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6369d339-98f5-4a48-945d-08573cd3f578/wahl_5537n_manual.pdfIn PDF document text
    • http://bipegokatif.onlinewebshop.net/mail_today_epaper_download.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001167d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167D 4864 bytes
SHA-256: 30732b431295b1e53627232b214d007ffba9a5840a70c747b98799920c5eb44b
font_01_sfnt_off00012712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12712 12288 bytes
SHA-256: 5c878c506b4256e74388daa139820630e9c87814f324e44fd32d999d19bf84cc

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