Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9f08d7b8f70a14c…

MALICIOUS

PDF

104.5 KB Created: 2021-03-08 21:41:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3813d173d6881ea7479bf150944de2c7 SHA-1: 2f8b2dd4a49eccc89bfc4184589a1c1a8929e20a SHA-256: c9f08d7b8f70a14c238dabf843728f0fe4383eb2fd5f74ad3d7b66ad258384a8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9985

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://leonvi.ru/strik?utm_term=que+es+mecanica+dental PDF link annotation
    • https://kenemujawov.weebly.com/uploads/1/3/4/6/134645985/29b0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483602/normal_5fd2696625066.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412387/normal_5ff16ac3a3790.pdfIn PDF document text
    • https://cdn.sqhk.co/dejijadu/HaZhcq2/ryan_toys_fake_video_call.pdfIn PDF document text
    • https://kazigujexumakul.weebly.com/uploads/1/3/4/3/134320364/0e586b031860f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464068/normal_6045f91031daf.pdfIn PDF document text
    • https://pufukowog.weebly.com/uploads/1/3/4/5/134583281/2872a59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492259/normal_6041d4ad4334e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464877/normal_5fdb2a26b459f.pdfIn PDF document text
    • https://cdn.sqhk.co/gadewekunel/hfzjbhe/99619457571.pdfIn PDF document text
    • https://cdn.sqhk.co/fovomesit/fgiGhic/ai_virtual_assistant_in_healthcare.pdfIn PDF document text
    • https://cdn.sqhk.co/jomonufo/cJshgfL/43733400333.pdfIn PDF document text
    • https://noruwapawufibem.weebly.com/uploads/1/3/0/9/130969999/3484063.pdfIn PDF document text
    • https://cdn.sqhk.co/gixezovof/LnhiyGD/remnant_from_the_ashes_escape_the_lab_key.pdfIn PDF document text
    • https://sufifova.weebly.com/uploads/1/3/4/7/134736026/d9cc2.pdfIn PDF document text
    • https://cdn.sqhk.co/gutejalajige/jeicxgz/free_learning_apps_for_preschool.pdfIn PDF document text
    • https://cdn.sqhk.co/xotosobupis/Aibkzs9/2750027150.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://larukanogut.epizy.com/fazajewixajuxedasemeloka.pdfIn PDF document text
    • http://fitatina.rf.gd/5807371152.pdfIn PDF document text
    • http://vonimamodiji.rf.gd/ruluxosegugijetidajetav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c48a4fd3-d9e3-41dd-a705-b56fb51be603/how_to_write_a_thousand_dollars_in_numbers.pdfIn PDF document text
    • http://nawugem.epizy.com/popowepudotixuruxab.pdfIn PDF document text
    • http://jigosip.epizy.com/nonstop_ball_mod_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e01f760-e6ae-4866-9b4e-7fa60ef15a0a/el_arte_de_amargarse_la_vida_resumen_por_capitulos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2ce4738-5518-41ca-9a96-5a7fa05d4cd3/how_do_i_get_team_aqua_out_of_lilycove_city.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001588c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1588C 5052 bytes
SHA-256: f4c21f69e9fb3a175c65fb4307245ee3c5ebf1272b9277b697c5a13ce0b755de
font_01_sfnt_off000169a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169A6 12708 bytes
SHA-256: 7b1c843d1a058cb02629bb55b812cfbbcd6bf2956c991f20240bd4c6bc86b6ce

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