Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc148a345fd36c39…

MALICIOUS

PDF

77.6 KB Created: 2021-03-23 19:26:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 101138436ac7a642b21d372c5bd413db SHA-1: 36e81aeb4feccf3f3ca940a904e1894723fe6094 SHA-256: bc148a345fd36c39a9ad0acf1071357bff9382471c23fde3c6d55ee519a9d431
66 Risk Score

Malware Insights

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

The PDF file contains embedded URLs, one of which points to a suspicious domain ('ponafet.ru'). The ML classifier strongly flagged this PDF as malicious. The document body and metadata appear to be obfuscated or corrupted, but the presence of external links suggests an attempt to redirect the user to a malicious site, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://ponafet.ru/wix?keyword=sheila+keen-warren+verdict PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391893/normal_60225bab0c6b2.pdfIn PDF document text
    • http://tezibif.mygamesonline.org/do_you_capitalize_the_words_in_a_title.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/flhdSij/cops_and_robbers_creative_codes_fortnite.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418166/normal_5fdae3d98ea97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501791/normal_60461ba318583.pdfIn PDF document text
    • https://cdn.sqhk.co/wemitupu/MlTwFjb/painter_mobile_full_apk_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485299/normal_6019103c192ed.pdfIn PDF document text
    • http://kudikadip.getenjoyment.net/sopirilupefadeloki.pdfIn PDF document text
    • https://cdn.sqhk.co/sipebililofo/dvyghiP/cubic_duel_fight_3d_mod.pdfIn PDF document text
    • http://retamos.mygamesonline.org/kotor_walkthrough_tatooine.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/QhghiSa/anti-_virus_game_rules.pdfIn PDF document text
    • http://gadatoreneperil.mygamesonline.org/a_discovery_of_witches_season_2_episode_4_streaming.pdfIn PDF document text
    • https://cdn.sqhk.co/mumesimasozo/BUjjfwH/2021_starcraft_311bh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388407/normal_6039ba2f63160.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/5df0751a-9c1a-4b67-9c22-2aa0f2a79902/what_is_the_easiest_way_to_learn_medical_terminology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/322c7a1b-95ac-439a-a7e2-2ace73751b59/spiral_dynamics_test_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe2ec05a-76a6-4c0c-966e-1f9e11d324d0/dyson_ball_animal_2_total_clean_filter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6455634-98a5-41ca-8929-60329e7d28b7/suwesugipifiwebikotagef.pdfIn PDF document text
    • http://fararisujis.myartsonline.com/24991495259.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BA 4876 bytes
SHA-256: 4df25b0c7f86067f89889a0d2f417d237396d2cc9be96408701da17edf99838a
font_01_sfnt_off0000f451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF451 11304 bytes
SHA-256: 5a342fcc21ac5a2e3dd63549a5be5d53923d97dec29abb0208bbc3ca20ebb1f8
font_02_sfnt_off00011989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11989 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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