Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b556b5341b4f8f2…

MALICIOUS

PDF

78.1 KB Created: 2021-03-17 17:00:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a5a70d482d7834115301a72bedaa220e SHA-1: 98243232827eeaf272654e23d172e0c91c73a150 SHA-256: 5b556b5341b4f8f24de37213266f7c20496d9921a70ec88e08582ccf19602258
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 0.9997

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://jumiwimov.ru/123?utm_term=word+document+genogram+template PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4495385/normal_5ffd4e1ed9477.pdfIn PDF document text
    • https://cdn.sqhk.co/nopavoboriru/fgxigij/mevirabagekumijirep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372955/normal_5fe8416876b9a.pdfIn PDF document text
    • http://pixidilivutep.medianewsonline.com/samsung_bd-p1590_blu-ray_player_remote.pdfIn PDF document text
    • http://rixuliketasaban.mywebcommunity.org/samsung_curved_uhd_tv_6_series_6500_55_inch_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/tamenotu/XgfiaQL/54024565082.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454990/normal_5ffa267884446.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414172/normal_6002afaa33351.pdfIn PDF document text
    • http://topstudy.fun/free_peugeot_306_manual67rlg.pdfIn PDF document text
    • http://dotekebenutedex.scienceontheweb.net/canon_eos_rebel_xti_400d_review.pdfIn PDF document text
    • http://manamuposa.getenjoyment.net/the_long_haul_rodrick_funny_moments.pdfIn PDF document text
    • http://pedron.fun/vowizuvuti2dyep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462694/normal_6015692728fc1.pdfIn PDF document text
    • https://cdn.sqhk.co/ravawiku/ihbgeid/sisters_movie_1973_cast.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://74269c25-1731-4359-90d4-804f54ef9c1c.filesusr.com/ugd/b5973a_24e8d3361b264aa29a63324359c164bd.pdf?index=trueIn PDF document text
    • https://1b3fde16-7575-45ba-b40e-8916c64185ca.filesusr.com/ugd/8874e8_384ccfd939d34a5f97026a9850fb6bf9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e543460f-28b2-4f0f-8aeb-c36244ac159d/64332100418.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6472506-2a9e-43d8-aca4-301ca0d89228/casio_g-shock_mens_chronograph_watch_ga110gb-1a.pdfIn PDF document text
    • https://e1eccfe9-8888-4f52-a155-e9c8e84e0752.filesusr.com/ugd/4fb05f_b349bb2d2f7f4132894c6751aa05b8d3.pdf?index=trueIn PDF document text
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_d69bf5e536b24879a0251508e4267374.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2c730ce-8922-4175-a903-d7bf72f903d7/rejevuvu.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://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDC 5228 bytes
SHA-256: fa1508507badaee0bd85babf9ac9adb79db9beb308a16008fe49676fec8b2570
font_01_sfnt_off0000f191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF191 7788 bytes
SHA-256: b5bf7050a02e5fe6e80669a81a81bdadfb70f76ca6870136f126bcd194e9fda7
font_02_sfnt_off0001070c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070C 10412 bytes
SHA-256: 217f8e03d9ad13d40e91e1d5e0719d8648703e0445e34d0bb8eb5bbbbf99b3cc