Malicious PDF — malware analysis report

Static analysis result for SHA-256 775dd25206d2a177…

MALICIOUS

PDF

137.6 KB Created: 2021-01-06 21:16:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: e06d5143245ead0e577929b019a19741 SHA-1: 5098d7f7d25c9f3cf6537c37b865b36315f9f1fe SHA-256: 775dd25206d2a177cf218ec7ecac3e75cd23fca9c9e52d9c110bf9db444bc974
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, identified as a PDF link farm, with a critical heuristic firing for redirector links. One of the primary links points to a known malicious redirector, and another points to a PDF file hosted on AWS. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a high likelihood of malicious intent, likely to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://cctraff.ru/aws?utm_term=assamese+bihu+song+janmoni+2008 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4416918/normal_5fe8e10ec4251.pdfIn PDF document text
    • https://cdn.sqhk.co/sebixodof/2pxjMfm/notify_nyc_alternate_side_parking.pdfIn PDF document text
    • https://fagisidide.weebly.com/uploads/1/3/2/6/132682833/ff4f5a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/aids_full_form_in_computer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5afc873-0e83-40c7-b628-8dc53bbfd6e3/dragon_ball_fighterz_cheat_engine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fc2d1b0-ef1f-4a44-92ef-906a71f9d582/59375589939.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/piroduzugaje.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/uf_century_tower_tour.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/bimadulopewifedagej.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/diruri.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/97294775057.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_off0001bfff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BFFF 10032 bytes
SHA-256: 24cec3b88572e1a829229c91e0aeccb0547bf3b11fc26a307ca105c4adc2b4c5
font_01_sfnt_off0001e0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E0D6 5644 bytes
SHA-256: 490633d227cfe4b9b5818702b90430ab49d522a0974b7baf728f9a136f9a29bb
font_02_sfnt_off0001f3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F3E8 11040 bytes
SHA-256: 1be92fbbf7454023ee6034ca9dcab55c26f19b0e5623d9e675aea86ef5228e8e

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