Malicious PDF — malware analysis report

Static analysis result for SHA-256 54a92e917acbee15…

MALICIOUS

PDF

73.2 KB Created: 2021-03-06 07:07:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9f6d767055e461de143187d2f9569a4c SHA-1: 47057dec965955020d9185b239275cb97c6d3168 SHA-256: 54a92e917acbee15df973be9223032ab13a692e9df672166c3925163a1f5fe37
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and external links are indicative of a phishing or malware delivery mechanism, likely leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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 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.
  • 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://mezovuduw.ru/strik?utm_term=how+to+install+chamberlain+wireless+keypad PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454290/normal_60152955a9001.pdfIn PDF document text
    • https://cdn.sqhk.co/lofakekaf/a4ggnGp/xulesusuxebugofozitala.pdfIn PDF document text
    • https://cdn.sqhk.co/zafowavo/ggphiiq/833_e_front_st_traverse_city_mi_49686.pdfIn PDF document text
    • https://cdn.sqhk.co/naziwixolagu/orHie32/samsung_level_bluetooth_headphones_price_in_pakistan.pdfIn PDF document text
    • http://sparzha.club/dominos_garlic_butter_sauce_recipe01qfq.pdfIn PDF document text
    • http://fruitnaturs.space/keduzuwuwoxakyf56u.pdfIn PDF document text
    • https://cdn.sqhk.co/litopozuf/fxYQMgg/h_band_smart_watch_instructions.pdfIn PDF document text
    • http://tomandbxof.site/latest_bollywood_song_status_video4jv15.pdfIn PDF document text
    • http://shopwithsale.website/betika_lite_appev9fk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368752/normal_5fd67579b19c1.pdfIn PDF document text
    • http://fruits-summer.fun/necronomicon_the_anunnaki_bible_downloadvjvzw.pdfIn PDF document text
    • https://cdn.sqhk.co/nozelenid/lhdO7gg/wwe_champions_2020_hack_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496585/normal_601ead742f0ec.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizilo/fIjTjjD/hd_pic_sad_boy_alone_weeping.pdfIn PDF document text
    • https://cdn.sqhk.co/redexisa/iejgVig/miwudolovu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421940/normal_5ff29e86ef1ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454971/normal_601a2999cafec.pdfIn PDF document text
    • https://cdn.sqhk.co/xeduwukaxusa/jighH1r/ap_world_history_project_ideas.pdfIn PDF document text
    • https://cdn.sqhk.co/jigitovewuk/hihagca/31659531473.pdfIn PDF document text
    • https://cdn.sqhk.co/kevapaboxer/hgidRhg/25658034729.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/eee1d190-fcbc-4f62-8331-96b3e473507e/boards_and_beyond_promo_code_november_2020.pdfIn PDF document text
    • https://6440a9f6-5e82-4153-977b-4ffe9374ec4a.filesusr.com/ugd/7182f3_612052f3d4ed4781a365f7443420f9b0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b4c3850-c232-40d7-86c2-db4b8e83f017/chromecast_h2g2-42_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9adc351-7b9a-46a4-8708-53ba120c2d37/how_to_unclog_a_kenmore_ultra_wash_dishwasher.pdfIn PDF document text
    • https://2b08c346-38d8-4763-b559-bb9d4fff2313.filesusr.com/ugd/40c9d6_c4dd45a121154a6f89cd50365a29bab5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/78bbd94e-b0dc-491d-9dfc-afc08e94dbc7/fifododokujerum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e71b092-0aa2-48c7-8b4c-9e196daaa146/stock_market_crash_1929_apush_quizlet.pdfIn PDF document text
    • https://5d94d51b-2702-4b64-8df3-eadd022f3edc.filesusr.com/ugd/2ddd39_90bdd22ec27e4ae8a8968428dc76f958.pdf?index=trueIn PDF document text
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_8f2902356ea647dc91b286bab2d9bd53.pdf?index=trueIn PDF document text
    • https://c6926203-1eb9-401e-9afa-11f61f201807.filesusr.com/ugd/685707_956ed994dab24d438854fed1b12babd9.pdf?index=trueIn 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_off0000e0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DF 5672 bytes
SHA-256: ab8944b5ccc8f930224b44b6280148cfba418c7436caea434235050886973926
font_01_sfnt_off0000f402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF402 10048 bytes
SHA-256: 73fdf2961470097edabeb9592a3942189e0bfbe5635283e2b0bb280435b6e7fe