Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd4b939f913e00ed…

MALICIOUS

PDF

76.9 KB Created: 2021-04-02 18:39:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 50d92bed920132a8704369845d3f08d3 SHA-1: ee1cfe3c06252617fe62023a85017fbd4171e8f9 SHA-256: bd4b939f913e00edfe2587d0d49303153489afa3df3aee888f735371d9cda4e4
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one prominent URL pointing to 'baarspo.ru', suggesting a potential phishing lure or a link to a malicious payload. The document's content, though obfuscated, appears to be a deceptive lure related to a popular game guide.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baarspo.ru/strik?utm_term=dungeons+and+dragons+5e+xanathar%2527s+guide+to+everything+pdf PDF link annotation
    • https://cdn.sqhk.co/nitagalut/KhbhbXo/best_iq_test_score.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484993/normal_6041c8cab7127.pdfIn PDF document text
    • https://cdn.sqhk.co/bunewonu/NfSvyid/live_video_call_app_name.pdfIn PDF document text
    • http://imm-shoes2.club/equalizer_apo_windows_10c8954.pdfIn PDF document text
    • https://cdn.sqhk.co/kufusivekogo/aibYjhp/27305570781.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378386/normal_60623e420092e.pdfIn PDF document text
    • https://cdn.sqhk.co/wojipezusax/GJ4gche/game_programming_in_c_sanjay_madhav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391308/normal_60250c28b920c.pdfIn PDF document text
    • http://uggi-ugg.com/what_is_a_emergent_strategy_in_marketing6cpxz.pdfIn PDF document text
    • https://cdn.sqhk.co/towevefizub/bCEjijg/nusigepuxomivu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455399/normal_600485246febe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_a68db63fba13470f8aa6d81f9c2ae90d.pdf?index=trueIn PDF document text
    • https://9539e3d7-93ad-434a-85ac-22bd9bdb82bb.filesusr.com/ugd/df7b34_096931b5a3cb473d9b72a2722a7f93a5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jebokizez/47768837657.pdfIn PDF document text
    • https://b19b3b79-9ae2-4e99-9b16-ef32671d60f4.filesusr.com/ugd/0bc867_c8179e997f4649d196f92f95c53110d9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1140b287-ebd7-49d6-b876-02c15cc1a536/94048126384.pdfIn PDF document text
    • https://2dcb0092-dd22-4cef-90c1-8c398f802bb7.filesusr.com/ugd/ff3115_291e8387b1e54031abd3338dd33d9af0.pdf?index=trueIn PDF document text
    • https://6e345194-e688-4037-aa24-2ff230a16836.filesusr.com/ugd/ce9fe1_4956924da9e54475851ff1fcaec8c1b9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/53a7ad76-c50f-44d2-a326-8a722281fc5b/53335006704.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/923ec214-a88d-4fc8-965a-9baa2063ba8e/the_lion_king_full_movie_1994_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1af40f7-b4c3-4ded-a3f5-a2313acd1cb0/one_punch_man_season_2_english_dub_dvd_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcb99bfb-44d8-4696-aadd-1fd97c8a031f/9372236888.pdfIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/57942884121.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_off0000e90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90B 5656 bytes
SHA-256: a01f6729107c777d5195406cb5b7352f5cb52866bfab1a53fd68e6bfcbc06f7b
font_01_sfnt_off0000fc66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC66 11496 bytes
SHA-256: fca8b4766acf5147dc6b9584b5db21c273dd26522fd1f4e5ac40f16d2d116372