Malicious PDF — malware analysis report

Static analysis result for SHA-256 b65f2669aab58720…

MALICIOUS

PDF

69.3 KB Created: 2020-12-26 01:51:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: f7468329fe7d725b00d88746041c625e SHA-1: 087f014c15e48240090c22f7cdbdd1a5d2de502f SHA-256: b65f2669aab58720819930d3681be049bed40e5643f4d563487e1159f093d491
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing indicating a malicious redirector link to 'https://ggtraff.ru/strik?utm_term=tennessee+titans+covid+19+news'. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0'. The ML classifier output of 0.999735 further supports its malicious nature. The document body appears to be heavily obfuscated or corrupted, preventing a clear understanding of its content, but the presence of a malicious URL is sufficient evidence of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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/strik?utm_term=tennessee+titans+covid+19+news In PDF document text
    • https://cdn-cms.f-static.net/uploads/4462714/normal_5fa4d787a4d27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459166/normal_5fa7286850b39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415946/normal_5fbe1e41c1939.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453142/normal_5fe60ade70323.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387825/normal_5f9714c2bf35e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494429/normal_5fabd54ac3599.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371543/normal_5f8882643b935.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/subud/33555605254.pdfIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/97611203495.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/binaural_stethoscope_information.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c80f233d-610c-48bc-a418-4808eec8d9fe/hells_angels_patch_for_killing_someone.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41E 5116 bytes
SHA-256: c993789228bbee3e7bc683ca0de9521776bb28b70eeb41806be0c3f4ee919a3d
font_01_sfnt_off0000e5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B4 10344 bytes
SHA-256: f294fd2496020bed2294134d68dc2a701baa4467d50a6589b9b19659e8b80083

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