Malicious PDF — malware analysis report

Static analysis result for SHA-256 f086d89504ce84a5…

MALICIOUS

PDF

75.4 KB Created: 2021-03-25 12:04:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9fe62b30e2a8c29d367b1ab196ee06a7 SHA-1: ab531fd1282c2e503d95800e42294433b7fca242 SHA-256: f086d89504ce84a5bd194e69233bbe8a1d3844fd5d740ce6fd277fd5d43e2dd2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The presence of PDF-specific heuristics and embedded URLs points towards exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/award?keyword=simple+performance+appraisal+form+pdf PDF link annotation
    • https://cdn.sqhk.co/goxejake/jhgdlhc/64874734345.pdfIn PDF document text
    • http://limuzinof.ru/is_vinegar_a_weak_electrolyte579kj.pdfIn PDF document text
    • http://best-store.club/28812295346s7w2q.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381539/normal_5ffdfdfec875b.pdfIn PDF document text
    • https://cdn.sqhk.co/zopizote/jcjeXjh/stickman_shooting_action_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/fagaxirupunu/5QigfoN/sirakepabuligomaderu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366350/normal_5ff59b20aba00.pdfIn PDF document text
    • http://epipog.com/328368127415f7xf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528876/normal_602a8de1d1a17.pdfIn PDF document text
    • https://cdn.sqhk.co/rolileduvof/zYifWib/98755206133.pdfIn PDF document text
    • http://pedron.fun/7319868759206kp4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486192/normal_603ba9ea8ff9f.pdfIn PDF document text
    • http://vivadoctor.ru/vovonabunrm9cp.pdfIn PDF document text
    • http://intereriia.com/multiplication_of_decimals_by_powers_of_10_worksheets64sk3.pdfIn PDF document text
    • http://vseti.life/bursary_application_letter_templatecjv3w.pdfIn PDF document text
    • http://gdztut.com/20807667663kamna.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/18bb7c27-6e9a-4da6-8b59-39bc74a6c0f5/plan_de_estudio_2011_secundaria_educacion_fisica.pdfIn PDF document text
    • https://c064424b-11a8-4e39-a524-24a74bcd733d.filesusr.com/ugd/54e393_73427f3fe32c46e5aa8aff8c76a7608b.pdf?index=trueIn PDF document text
    • https://18282f24-d4e3-4c19-b4d9-8e3fdaa82145.filesusr.com/ugd/df2b7b_c01a21754098408bacdb966e677fdf78.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b50a3226-5772-4a8c-9c30-a54eb3b29a4f/ti-30x_iis_change_battery.pdfIn PDF document text
    • https://4a31e3f8-49e3-4331-b1a9-c0bb7a6b9dbc.filesusr.com/ugd/599f1c_0e3a83e406294e9486cfa7ceec940d3a.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAE 5404 bytes
SHA-256: 7c5a96f21f4f13a81e5cdfaf935cc560444716c7fbda542be8121d0a8e4cf352
font_01_sfnt_off0000fcf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF2 10288 bytes
SHA-256: af4ffd2c7e5e836b266ebb97f4dec8b8daed67b3ff4f55f1574a7a6e33ea0adc

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