Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d7b4afd56ef5e88…

MALICIOUS

PDF

88.4 KB Created: 2020-11-24 18:03:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 99f36fa51250bf811e0d56d481cbd46a SHA-1: b97968ede3d06fa4322e44f028196e6b3b5210a9 SHA-256: 4d7b4afd56ef5e885610dcc75a91f02afdc857dc392289d58a88cd8a330b7e2e
254 Risk Score

Malware Insights

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

The PDF contains numerous links, with one critical heuristic firing indicating a link to known malicious redirector infrastructure. Another heuristic flags the document as a lure for a password-protected archive, suggesting it's a delivery mechanism for a secondary payload. The ML classifier also strongly indicates maliciousness. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://ggtraff.ru/aws?utm_term=android+republic+dbz+legends In PDF document text
    • https://pivazadigemeza.weebly.com/uploads/1/3/4/6/134642233/dedeketan-lorori-rumijobamuk-kuditafesosa.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/6897fce5-ad7e-45b4-9dea-92330c79898d/28369520364.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5885d17-e674-4980-918a-700e68ebe800/cryptography_and_network_security_fo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef87c34f-d593-459f-b03c-42e623c50833/gumulo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dbb5e9f-dfea-4f72-8a68-2cd5307a1358/ejemplos_de_procesos_administrativos.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/tijanuxidujosi.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/eosinophilic_esophagitis_guidelines_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ce817e0-8512-432c-8fbf-f41eeecbfe99/relion_glucose_meter_error_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88ed33dd-12aa-44fa-a33e-2c53f2ac2af2/sarainodu_audio_songs_free_naa_songs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f265c23-5a51-4fcb-8951-dbfdd3e19350/thing_thing_arena_4_crazy_monkey_games.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/54541201677.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB7 6040 bytes
SHA-256: dbec4a584db4bd246d043436f62281b371c7ec581209541a7fa933d466337621
font_01_sfnt_off00010f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F92 5208 bytes
SHA-256: 785f5c75f91213caa5765f7c3122850c3ddc95bc0d1d7f0f9772ae460ab43abe
font_02_sfnt_off00012159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12159 2468 bytes
SHA-256: e2c4bd44b03e950acc8b739c426831c27d59e78646ffb76a2129046b4903e497
font_03_sfnt_off00012c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C87 11636 bytes
SHA-256: 32612301a43a993c783506d8f873873ec1b37cfc48f2ade63f7b86032d346055

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