Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b2367a26dd61c07…

MALICIOUS

PDF

78.2 KB Created: 2021-06-02 10:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 138ffce7a4ddd0fd1d03a1120bda24f8 SHA-1: 652ab30c7cde3bea001474a5f2fcdd23213e12ef SHA-256: 4b2367a26dd61c07e10815b70bb062452194b0f588577bb31b4ca4278b3391c7
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://huntic.ru/pbw?utm_term=zinda+rehne+ke+liye+ek+mulakat+zaruri+hai PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381539/normal_5fd64f677a677.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375704/normal_6008714230e98.pdfIn PDF document text
    • https://volikupiwete.weebly.com/uploads/1/3/4/6/134676366/1460790.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445868/normal_602645ddf2372.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485329/normal_603b95df769f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388617/normal_604ce5a6381a9.pdfIn PDF document text
    • https://sesirolomozanu.weebly.com/uploads/1/3/2/7/132741009/dawux.pdfIn PDF document text
    • https://xinewufovina.weebly.com/uploads/1/3/4/2/134235071/sibojir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492257/normal_6019a33fc6425.pdfIn PDF document text
    • https://sevimuxeso.weebly.com/uploads/1/3/0/7/130739978/21721d7a580.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461767/normal_6005c380815e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378153/normal_60308807427d2.pdfIn PDF document text
    • https://jikomaviwibu.weebly.com/uploads/1/3/4/3/134365837/1135472.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/f15b1188-14f9-4b9e-b956-e226fc0de8f5/2905627936.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/w/file/fetch/144419811/33950624282.pdfIn PDF document text
    • http://zuvevetub.pbworks.com/w/file/fetch/144423258/98681284184.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c5029d0-8faf-4442-8eea-11c08bae026c/64978326797.pdfIn PDF document text
    • http://ziriwuru.pbworks.com/f/how_to_change_label_size_on_dymo_connect.pdfIn PDF document text
    • http://xedidovetaw.pbworks.com/w/file/fetch/144416070/how_to_invite_someone_for_microsoft_teams_meeting.pdfIn PDF document text
    • http://ronefete.pbworks.com/w/file/fetch/144491241/manual_capsule_filling_machine_south_africa.pdfIn PDF document text
    • http://gudikijuruf.pbworks.com/f/super_smash_flash_beta_1.2_unblocked.pdfIn PDF document text
    • http://polubisoxuwo.pbworks.com/f/rurozowivu.pdfIn PDF document text
    • http://poforezufovu.pbworks.com/w/file/fetch/144459528/similarity_and_proportions_worksheet_answers.pdfIn PDF document text
    • http://fepewuwakow.pbworks.com/w/file/fetch/144483801/defining_non_defining_relative_clauses_exercises_b2.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_off0000f3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EB 5060 bytes
SHA-256: 82e7853add18399ca1153ec4dce197f0de0500ea098f4e2e9e1739e657706ac2
font_01_sfnt_off000104ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FF 10984 bytes
SHA-256: bd13eda4ec4f250dd135c25b6475f6ab7c89f85251b9f75cbe5de209864e604e