Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a07dfef4dd3ad38…

MALICIOUS

PDF

74.3 KB Created: 2020-12-08 23:44:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 64ef45fcb188d401092d298b7fec1679 SHA-1: ec942efb6136379be5eb3228aab6a90ae8af998a SHA-256: 2a07dfef4dd3ad38f0e6d850b01ee30c2df882ae681af88ec2f5ba2004207546
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure. Additionally, it features a PDF link farm with numerous external links, including one pointing to a potentially malicious URL. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/123?utm_term=pto+meeting+meaning In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365570/normal_5f89d52543e87.pdfIn PDF document text
    • https://zabuxowinuj.weebly.com/uploads/1/3/4/8/134874463/7207375.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419236/normal_5fa2d350957ff.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/10fc55a8-1bdc-44d5-b638-d86cf20220e4/surikuzo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42fcb098-c462-4b93-b62f-87f309a0f26f/prepare_a_bank_reconciliation_for_del_gato_clinic_using_the_above_information.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1e5b222-c035-4564-92a9-6ec9c9bb04bf/tempo_sidekick_t_n_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfb0d3bb-6a2b-4191-b5cb-8d8ba6da5b35/61108672468.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/85345256676.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8450025-6395-4b9b-babe-0ea1b678e627/chess_openings_for_black.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/798b62a7-2ca9-4866-a1cc-0a0097adc581/79021841185.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33f1b4ab-043b-4136-a336-9622bb0e32ec/govuloronupizusilumewomal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96c7511e-fdc7-498c-97fe-d5d710129c0a/129_rey_st._Del_este_oshawa_ontario.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7E 4700 bytes
SHA-256: 64f7899060e9b27d192c7d967945f28a08910f07a7367b96ddeefcbb10e89d86
font_01_sfnt_off0000de6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6F 12452 bytes
SHA-256: e935ab102620ce5dae93b4faa0b73330640e5299c21160379f971105377279d9
font_02_sfnt_off000107fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FB 16080 bytes
SHA-256: a534b91c4ec3d8756e3a834051570443c69e75f38d6508a28567570861ffac3d

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