Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e60d772305e053…

MALICIOUS

PDF

81.6 KB Created: 2021-06-02 23:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 36cbf9709738cf9c266f404a20c244e2 SHA-1: b167d5ad6c114f773b4978b170c4f0f213e3f2a5 SHA-256: 71e60d772305e053f0248757292cb8a51e0ac0cb997b43391ded82da89b3c611
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dugedepap.ru/123?utm_term=darksiders+warmastered+edition+ps4+trophy+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392656/normal_6049a4e62ebbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499935/normal_602aa3c1efcf2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464869/normal_5fcca9d072f35.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464524/normal_5fcc90bc8acda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470218/normal_6033008021916.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500429/normal_5fc9aaed38fe4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402717/normal_5fc9b1d48baef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470532/normal_5fd1b9b76f9b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408346/normal_6066febb270b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417834/normal_600e5cc4977d3.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4500183/normal_60b72070d9eb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495684/normal_6017c1c3ec109.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wejojixi.pbworks.com/w/file/fetch/144424269/78007567860.pdfIn PDF document text
    • http://magogopowo.pbworks.com/f/how_to_see_history_on_google_maps_apple_carplay.pdfIn PDF document text
    • http://xuvabufoj.pbworks.com/f/74863101235.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/w/file/fetch/144417282/how_to_find_moodle_answers_with_inspect_element.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4c73445-0f1a-436b-9256-3cc4cabff6c3/18001203897.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f33de62-d3e4-4030-abc4-0321f4ec477c/73886555321.pdfIn PDF document text
    • http://jajafad.pbworks.com/w/file/fetch/144428400/delta_skylar_crib_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59079e26-1a0b-417b-a53a-56376166b5b3/75544972231.pdfIn PDF document text
    • http://nunaruribeg.pbworks.com/f/famakasuvotodibolu.pdfIn PDF document text
    • http://gibuwodebu.pbworks.com/f/patrons_gratuits_patron_de_poule_en_tissu_a_imprimer.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A9 5688 bytes
SHA-256: 651bd2c56aa3ea4063404dfd47e189847e7f772f89c470360cbfd10c075af30e
font_01_sfnt_off0000fb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB04 11296 bytes
SHA-256: b3823857a23bb89512467482aa3fefba22c5a0ff4ea5862e788fb09d80373de9
font_02_sfnt_off00012185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12185 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501