Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3177e1c8f50160d…

MALICIOUS

PDF

74.5 KB Created: 2021-03-20 18:10:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 77831b6405a6245dc21947f88b2dec17 SHA-1: 49cc5ca11cc63300a1b695102a23a7c8bb74a649 SHA-256: b3177e1c8f50160d55934bd5be157041961613faee9f148114a8d62ca41448e7
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic to direct users to potentially malicious content. The primary URL, 'https://maypoin.ru/award?keyword=story+of+my+life+song+lyrics+pdf', is presented as a search result, likely to trick users into clicking through to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/award?keyword=story+of+my+life+song+lyrics+pdf PDF link annotation
    • http://ruzoboxilotazex.22web.org/what_does_the_ending_of_the_killing_joke_mean.pdfIn PDF document text
    • http://folokuvatajaweg.22web.org/97837516571.pdfIn PDF document text
    • http://xumupizaxuto.scienceontheweb.net/how_to_do_calligraphy_with_a_pencil_tutorial.pdfIn PDF document text
    • https://cdn.sqhk.co/tamaladafa/fiahjHV/sebimojagirigejefo.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/jicEuLZ/18650247457.pdfIn PDF document text
    • https://cdn.sqhk.co/nufesewepi/hhLy364/bukogimutubuxisugeno.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://53ebb62d-ddaf-432f-8dc3-1f4746653467.filesusr.com/ugd/bbd3cf_f74c580f796a47fd9ab2702909c3cf4c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fizufapu/cpu_cooler_performance_tier_list.pdfIn PDF document text
    • https://2b095ecd-e7a3-45cb-a122-23ed11f0a332.filesusr.com/ugd/613052_d46940860d4b423cb7a921f9db805293.pdf?index=trueIn PDF document text
    • https://e8c82854-2a0b-4c0f-82de-bac600ce06e6.filesusr.com/ugd/d017d5_bd24f6ed43f042eabe580c6a6cc419c5.pdf?index=trueIn PDF document text
    • http://jopavufugas.epizy.com/game_of_thrones_season_2_characters_guide.pdfIn PDF document text
    • https://aa4c2489-c93b-4667-afab-104bf5323bad.filesusr.com/ugd/8b49c6_a1fbf4189c854669b5926044130f7f2f.pdf?index=trueIn PDF document text
    • http://loxazugexola.epizy.com/86512525852.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/63703363676.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/tamil_movie_kaththi_theme_music.pdfIn PDF document text
    • https://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_bc70b12ca3084763b7140341eed20353.pdf?index=trueIn PDF document text
    • https://f89b8795-a90f-4359-81e0-6309601a98d9.filesusr.com/ugd/8e7730_7c11ee6296ab455c96bee63906811aaa.pdf?index=trueIn PDF document text
    • http://pulutugorivexek.atwebpages.com/how_to_calculate_standard_deviation_on_a_casio_calculator_fx991es_plus.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_off0000d752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD752 5260 bytes
SHA-256: 6ad94c543f60c0bcb9e9c331bf45a6ac7175487baf84b75643b3401d6f691979
font_01_sfnt_off0000e91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91E 11080 bytes
SHA-256: 928f69ff0dc59e8e92a330acb3f66a80c0759cfba7a214ab2743d987bc052202
font_02_sfnt_off00010e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E82 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e