Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf5d3e06fbd6fa9…

MALICIOUS

PDF

97.5 KB Created: 2021-04-17 19:12:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f78e55c8d38d38ddc21ea2fffd8d5c5b SHA-1: 99ce78e32488c69da6832b98a8c4df8d7f193c33 SHA-256: acf5d3e06fbd6fa9fc9e2f642f0c6c746101372f851dd67eb019590bdc367a8e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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://dafemum.ru/strik?utm_term=langston+hughes+educational+video PDF link annotation
    • https://cdn.sqhk.co/wisisatofife/jgVijic/bird_screaming_gif.pdfIn PDF document text
    • http://rumafelaneli.mygamesonline.org/19076872484.pdfIn PDF document text
    • https://cdn.sqhk.co/kavejufa/Qhgojfb/futapadori.pdfIn PDF document text
    • http://lugodapamaj.mygamesonline.org/grade_7_math_worksheets_algebra.pdfIn PDF document text
    • http://gevotutux.22web.org/numbers_in_english_1_to_100.pdfIn PDF document text
    • http://sevelorovuwo.66ghz.com/10547289271.pdfIn PDF document text
    • http://gepanukotex.getenjoyment.net/43614025007.pdfIn PDF document text
    • http://moxawunanenubop.sportsontheweb.net/26967815904.pdfIn PDF document text
    • http://bebetadiruj.mywebcommunity.org/what_is_the_default_password_for_night_owl.pdfIn PDF document text
    • https://cdn.sqhk.co/depifozopupe/RiaGshZ/42298732974.pdfIn PDF document text
    • http://gubixazolela.sportsontheweb.net/how_to_make_healthy_high_protein_smoothies.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://s3.amazonaws.com/sajatofubote/71422990111.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/51745663887.pdfIn PDF document text
    • https://45f91bdd-2b68-4e60-ae2c-b14373ae5332.filesusr.com/ugd/0d089b_3ee1c733ce214f438e2d16fed37c5000.pdf?index=trueIn PDF document text
    • http://sujawokasafu.onlinewebshop.net/campana_sobre_campana_letra.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/vietnam_miss_universe_answer.pdfIn PDF document text
    • http://tefabonapo.rf.gd/quality_management_definition_pmbok.pdfIn PDF document text
    • https://1ec9b6e7-17eb-4e1e-a994-ba5ce4cbdb7c.filesusr.com/ugd/d4a9d6_6b741afcb1c143f6ba970667d8fb46b6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/libosokune/dj_lyta_bongo_mix_2019.pdfIn PDF document text
    • https://6d251753-49d0-4f5b-a278-10ed1cacc9d0.filesusr.com/ugd/5c139a_bbd567439bc44804b0e71be405e8b236.pdf?index=trueIn PDF document text
    • https://f7927488-8152-43cb-a667-e231f58cc5c5.filesusr.com/ugd/950cc9_6f98c3274fc14fb1ba0cce4a947a1d06.pdf?index=trueIn PDF document text
    • https://c9b0c9dc-51ad-46ec-84b2-dbc26df53712.filesusr.com/ugd/b6f588_602b5de466de4fb78566d96b8dfcdf75.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001320c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1320C 4988 bytes
SHA-256: ded49fc3a8f97fa0797bcb71177bb43122454f744db616ae973f0899d9743b41
font_01_sfnt_off00014304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14304 11796 bytes
SHA-256: abcc9b1c0e644e7115b3787ff471e0199e4acb9bc8fa5524db40e79bf4842d15
font_02_sfnt_off00016aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AAA 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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