Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c88c60f1808fa2…

MALICIOUS

PDF

67.4 KB Created: 2020-11-14 22:20:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 89b35699b26db7e29dc4dbc3a1bf880f SHA-1: 5bd5a723286f14c1432854d79747ba810332e2d6 SHA-256: 85c88c60f1808fa286f67ac26da72050ba1cdfe81008e4c640481fc1cb9893c3
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the PDF structure suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://traffmen.ru/strik?utm_term=ingenieria+mecanica+dinamica+14+edic In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382192/normal_5f98937ed6fd9.pdfIn PDF document text
    • https://nifumusogukew.weebly.com/uploads/1/3/4/2/134265343/7193b74c29d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367277/normal_5f876c22ef369.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407304/normal_5f9fe6e3ca626.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/1a357fdc-67d2-4d1a-82c3-55bbf9b6c883/nefagujukikajusiluxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79189dc1-3364-4250-8a7c-32e805884de1/12250955019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70e7bedc-6ef9-43b1-ba50-7336a2bf9319/songs_with_similes_and_metaphors_in_it.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36ee0059-8716-4379-9868-b9c123cb3d01/diagrama_de_pareto_ejercicios_resuel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2171a214-eae1-4ecf-ac8c-6907f4db0189/84940647029.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/conical_intersection.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/81663506076.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e905eda4-bd57-4808-b530-6f6c70241088/tezudogum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06cd401a-8935-4023-801e-ed27b9f13018/add_roms_to_retropie_sd_card.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b12f4cf-907d-4cef-9eac-2efc062537bf/1559488149.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000baa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAA4 4724 bytes
SHA-256: 71153d2be703ea89dc610ebd47cd5ba950c5238fa4b87eba09062f1023b9e773
font_01_sfnt_off0000ca84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA84 11804 bytes
SHA-256: e3453ca34824c24f3b0514c7ef0be598f2c50ba9ddc5528ad99ce7ab9f02fa13
font_02_sfnt_off0000f111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF111 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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