Malicious PDF — malware analysis report

Static analysis result for SHA-256 378875f382211c35…

MALICIOUS

PDF

83.6 KB Created: 2021-03-23 22:15:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 4be8e3be73069ebc983ba8e2965be530 SHA-1: 5626b0e7a65f4e7137e1a08000a9af941e931719 SHA-256: 378875f382211c35e975041d2e175faf004870fb143923053a24dee664e1e2ae
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, a common tactic for distributing malicious content or conducting phishing campaigns. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate this malicious intent. The ClamAV detection and ML classifier further confirm its malicious nature, suggesting it is a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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.
  • 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://midufefew.ru/award?keyword=desenvolvimento+e+aprendizagem+motora+pdf PDF link annotation
    • http://zuvalasit.mypressonline.com/oxford_dictionary_of_accounting.pdfIn PDF document text
    • https://cdn.sqhk.co/bugininaxi/aIjaNzS/metuwak.pdfIn PDF document text
    • https://cdn.sqhk.co/lajefage/guphghe/spellbinders_card_kit_of_the_month_august_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/gciihgY/luzelak.pdfIn PDF document text
    • https://cdn.sqhk.co/xurinuwame/shahjkO/fujuzejoke.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://246406bc-bb0d-4f29-baed-d8a6153a9543.filesusr.com/ugd/3ddeef_5c96e37117c64fbebad7aa6d92051c31.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdef49b8-76d1-43ab-bce2-d31abbb64c79/sofazigopuna.pdfIn PDF document text
    • https://c6de0af5-2a4c-46da-924c-839bccb102c6.filesusr.com/ugd/5f1f0f_3786e9e4f9cb4c33be5bd16fbf559170.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/14b30c2e-49ca-47c1-945f-d08c35b45580/35415730931.pdfIn PDF document text
    • http://bodirinukamole.onlinewebshop.net/nudijima.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3a79006-cba3-41ba-a4a9-800cd67e14b5/54116079417.pdfIn PDF document text
    • http://moxosutemow.onlinewebshop.net/qualities_of_servant_leadership.pdfIn PDF document text
    • https://4eb83289-b313-4542-b68c-79a1d4783db4.filesusr.com/ugd/f6336d_5aaae7584a894b1e8ccd6269b220f01b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/5th_grade_saxon_math_book_online.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/low_back_pain_exercises_ortho.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/84706976877.pdfIn PDF document text
    • https://40fd9d30-e691-4ad4-9ff9-7de67b304886.filesusr.com/ugd/45b27a_b921027a89a641a489283a8351bf77cd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/farokof/1_cm_cubico_cuantos_litros_tiene.pdfIn PDF document text
    • https://973697ad-ffa4-4f9d-85cd-0c9d1ea039ee.filesusr.com/ugd/5f5755_f4050f180edc4c35a9afe95441a9f4d7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6a02257-5552-408b-9ca2-97e6fc0b041d/steak_tartare_origineel_recept.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a6aad0d-af23-417b-93be-d9d33f1797ad/7225168520.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b95d56da-06a9-4892-b3f1-b29896894693/veggie_side_dishes_for_thanksgiving_dinner.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/anonytun_para_pc_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd134d31-1147-4999-8f86-651c31823f9a/gowasenujoneraka.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_off00010112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10112 5468 bytes
SHA-256: 0613dbb2169844d822d0c6fb53a805c41d160b65c92e26839e6cb50a2f64c1a9
font_01_sfnt_off000113ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AD 14756 bytes
SHA-256: 6f06714b92d2704e19fb65943491648a0095c83de34f26c9b8a1c7186cb143d3

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