Malicious PDF — malware analysis report

Static analysis result for SHA-256 be6643b1ac9edf7f…

MALICIOUS

PDF

72.0 KB Created: 2021-03-17 18:04:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1b8e1ad5efbbe740f5e97f2f0f3d726d SHA-1: 571cfc6138b0869666a3393df34253c05f1932c5 SHA-256: be6643b1ac9edf7f67e1ca92678c8bf1d102489ccfb8828756660ecba91ca96b
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jottigo.ru/123?utm_term=suzuki+boulevard+s40+service+manual+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383295/normal_6016e0001007c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373248/normal_6027dadd90202.pdfIn PDF document text
    • https://cdn.sqhk.co/vumuwuxa/uhhijic/angry_birds_2_crazy_credits.pdfIn PDF document text
    • https://cdn.sqhk.co/migefareg/dgcvgde/63912233812.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459631/normal_60309f9ee9702.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421217/normal_5fd3b0e1e4a14.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f3dc8d0a-397f-4303-99a5-a7927e83d850.filesusr.com/ugd/e916cf_b45860ad62e4419e9979c332821698fc.pdf?index=trueIn PDF document text
    • https://72cee60b-533f-4fda-9f40-87b1bb6f0553.filesusr.com/ugd/590778_8dd51f1f658d4ec2a3ef75177faa2559.pdf?index=trueIn PDF document text
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_81eab1e2218e4f5296d3cae4914cf658.pdf?index=trueIn PDF document text
    • https://c207dc97-0cc9-441e-8caf-a702c1639d46.filesusr.com/ugd/36abe8_a1c9630e5f964f8ca465e97a1f661daa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b47b3d29-de15-4c66-bc8d-86fdf5143bd2/jupyter_notebook_free_download_for_windows_8.1.pdfIn PDF document text
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_f9dff34cc5a04d69bfd8eb817cc0b46f.pdf?index=trueIn PDF document text
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_1a921c5752e34da29533c44aae35fc46.pdf?index=trueIn PDF document text
    • https://b67fa923-03b4-4d21-b555-95ff628d7525.filesusr.com/ugd/1d4b90_a03ffdd57b0c417482b7b2f799f9d7d9.pdf?index=trueIn PDF document text
    • https://88966db1-4a83-4446-b941-f65022a6235f.filesusr.com/ugd/928e0f_b2cb33e7c70a446aaa62c3777e3d95c7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/92c38de9-1918-4045-afb8-fbf102e85f90/bravos_xl_washer_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6283a14-736e-4cfd-bc40-775f4b2ec8d0/febosabumezixonopaxenogup.pdfIn PDF document text
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_a76ecd497a7b4db9861ea31dfa0dd533.pdf?index=trueIn PDF document text
    • https://03aaa7dd-6608-466c-a68c-f41c59811c05.filesusr.com/ugd/ae15ca_429a906e9e024219a4113eae6566ac47.pdf?index=trueIn PDF document text
    • https://6ce95562-7558-49ee-a7b0-b3003db3b0e9.filesusr.com/ugd/d13e1f_5bc54b6914764672b13bcde809420824.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1593507b-4e60-43fb-ab9f-554a2dff3665/snapper_mowers_parts.pdfIn PDF document text
    • https://104e0e48-a4c2-4a03-8647-06ef64d4e6ac.filesusr.com/ugd/e2c6c1_94097736f6a74d3d9f3f36be5875f700.pdf?index=trueIn 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_off0000da00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA00 5948 bytes
SHA-256: 5df83fb7cb95598eb991cf1b579074d5aef9f31f4b35055db7b4eeff91ec04ee
font_01_sfnt_off0000ee44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE44 10520 bytes
SHA-256: 12e266822b9aeb71f11cd7eeff5b70ebe174ad98aaf91d319220b7c6313d4dc4