Malicious PDF — malware analysis report

Static analysis result for SHA-256 48356f4afe46d4d5…

MALICIOUS

PDF

69.1 KB Created: 2021-03-18 20:26:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 5036ec5ee6b9d3cd1714e4d11b2e5090 SHA-1: b7cbaca2b971d155c7caabadcd66516f74d42bb3 SHA-256: 48356f4afe46d4d56461086e2506a15f8f99c62ba4b91a49493be56ba96060dc
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are likely part of a link farm designed to improve search engine rankings. The primary URL, 'https://pelibifir.ru/award?keyword=atmosfera+sprawdzian+pdf+odpowiedzi', suggests a lure related to test answers. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution.

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 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.
  • 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://pelibifir.ru/award?keyword=atmosfera+sprawdzian+pdf+odpowiedzi PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408479/normal_5fef485a63ea6.pdfIn PDF document text
    • http://nenodipemuxok.mypressonline.com/atmega328p_full_datasheet.pdfIn PDF document text
    • http://mebevevi.mywebcommunity.org/bolowaxitejumixuluno.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461202/normal_5ff34c98866f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402247/normal_6043600a4e320.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496826/normal_5ff564375eb82.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://biburusig.myartsonline.com/37259205576.pdfIn PDF document text
    • https://s3.amazonaws.com/tubupejevomo/fodowagupasawemo.pdfIn PDF document text
    • https://9e2b3e3a-6a02-4d3b-8ba9-5acc01041672.filesusr.com/ugd/66c878_8db6f4c24dbf44348e5406d588794ec5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/20117914953.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38548199-e3c2-47e5-ae76-941f24a8bff4/best_battery_tender_for_car_storage.pdfIn PDF document text
    • http://zepizevut.atwebpages.com/definition_of_literature_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d13afd5-f271-4849-9e7b-7eee3403f8b6/asus_x555l_audio_driver_windows_10_64_bit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebf9cc30-dee3-4055-9f2e-22b02786803f/can_you_play_heroclix_by_yourself.pdfIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_5c088f8da0964003bb230275083e5b02.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zunaporam/51813244418.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9db0399-8177-4e20-83a1-a82a975e4f9f/how_to_use_humidity_controller.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/foserumuteduwoxezepodum.pdfIn PDF document text
    • http://tizexazebubo.atwebpages.com/wuwedixibudazejebimezizow.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/atc_around_the_world.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/bollywood_hit_audio_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/geneva_academy_llm_guide.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_off0000cf38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF38 5284 bytes
SHA-256: ff0e5b594b33d3ac9ad6edaeae2bc7771943f910cc50ef2b03908c4077611a4f
font_01_sfnt_off0000e135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE135 11900 bytes
SHA-256: 7908f018308cedde7a1aa4aa612558f02acdf56a3a807720d91a463c3d0b9dc0

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