Malicious PDF — malware analysis report

Static analysis result for SHA-256 96ae3cb56d2f71a0…

MALICIOUS

PDF

80.7 KB Created: 2021-04-04 20:34:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29e76a723eec30692b481c62a2753466 SHA-1: e2b790d682046e97d04f7113c59f16768ae79c59 SHA-256: 96ae3cb56d2f71a0c392ed4009b8832bc7a7657311f7da9a44c778d723422741
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 SEO-optimized and point to other PDF files, suggesting a link farm or SEO poisoning attempt. One prominent URL, 'https://maypoin.ru/123?utm_term=barcarolle+offenbach+sheet+music+vocal', is presented in a way that mimics search results, likely to trick users into visiting a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=barcarolle+offenbach+sheet+music+vocal
    • http://tesupelaj.sportsontheweb.net/best_acer_laptop_for_students_philippines.pdf
    • http://giwapuse.22web.org/application_of_third_law_of_thermodynamics.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kobivimelelo/gubironudedodewexadadurit.pdf
    • https://uploads.strikinglycdn.com/files/c05d719a-5ee3-4098-a068-6296bc444142/can_you_buy_adobe_photoshop_without_a_subscription.pdf
    • http://mazogakos.rf.gd/limevesivo.pdf
    • https://s3.amazonaws.com/verirejon/soundcloud_apk_for_pc.pdf
    • https://s3.amazonaws.com/janodojivi/what_flag_has_a_rattlesnake_on_it.pdf
    • https://s3.amazonaws.com/bifadiwuwileji/47036854250.pdf
    • https://uploads.strikinglycdn.com/files/dde5c7be-7ef3-49b4-9234-f40d9f0ea30b/95724692878.pdf
    • http://potepemezupop.epizy.com/medicinal_value_of_bitter_leaf.pdf
    • https://s3.amazonaws.com/gajabedafot/all_android_phone_under_12000.pdf
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_ce3825ce249740afa7aa55059d5e562d.pdf?index=true
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_456786e5fcd7489d93797b44d729df5b.pdf?index=true
    • https://s3.amazonaws.com/genedonapubefe/1977_cessna_172n_poh.pdf
    • http://poxemibusap.epizy.com/film_basara_heroes_2.pdf
    • https://uploads.strikinglycdn.com/files/39e5fdf4-334c-423e-97bf-2185f59eb18a/is_a_new_harry_potter_movie_coming_out_in_2021.pdf
    • https://s3.amazonaws.com/gupojakami/achmed_saves_america_free.pdf
    • http://dojafeduzig.myartsonline.com/aboriginal_language_map.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5f0.bin
b77619da1c5ebc7a06afde2d5df5f51995f7b73f256ea623f4d4c8c8039c04e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F0 5372 bytes
font_01_sfnt_off0000f816.bin
1f0b0424a395bda4f4e824b6787e64dbc68228a2ec05eee2448e1c575408122e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF816 11380 bytes
font_02_sfnt_off00011e71.bin
4360e29b7d2504916afe74d557016965ce00ddb6e9b1d1498b998f2d7a1046f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E71 16184 bytes

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