Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7d13d7ce501ef5f…

MALICIOUS

PDF

79.7 KB Created: 2021-01-16 15:55:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ed2b3f4daa73d56c5bff026c56ff0771 SHA-1: 95c3bd2c2e5eb025d7958e2cec4fad08d2f0a0cf SHA-256: c7d13d7ce501ef5f76030900302f212406035939f2a48fc3528e0ebad73bded3
204 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains multiple embedded URLs, with at least one identified as a malicious redirector. The heuristic firings indicate the document impersonates a signing service (DocuSign) to lure users into clicking these links. The presence of a malicious redirector and the ML classifier's high confidence score suggest the primary goal is to lead the user to a malicious site for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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 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.
  • Document signing service impersonation lure medium SE_DOCUSIGN_LURE
    Document impersonates DocuSign, Adobe Sign, or a similar signing service in a signing-request context
  • 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=small+pdf+online+signature In PDF document text
    • https://site-1178301.mozfiles.com/files/1178301/lugiwizevakovotesifi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365626/normal_6001e694100dd.pdfIn PDF document text
    • https://site-1178425.mozfiles.com/files/1178425/kenya_budget_2019_20.pdfIn PDF document text
    • https://site-1175150.mozfiles.com/files/1175150/lovestruck_choose_your_romance_mod_apk_7__0.pdfIn PDF document text
    • https://teveluzisobe.weebly.com/uploads/1/3/5/2/135299025/zifor.pdfIn PDF document text
    • https://cdn.sqhk.co/nizekidido/dhjxghf/archer_season_11_episode_3_release_date.pdfIn PDF document text
    • https://site-1173807.mozfiles.com/files/1173807/pick_up_lines_for_men.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/guwutivupudutu/boundary_layer_theory_in_fluid_mechanics.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/wuvejawaviwixodoxezuje.pdfIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/andhra_pradesh_grama_sachivalayam_hall_ticket.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_off0000fbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC6 5464 bytes
SHA-256: 901d1e4afb9ec2fbf0336c577034fc50565854b91b89a15acbbb83a7d4f55288
font_01_sfnt_off00010e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3D 10668 bytes
SHA-256: e95acb2709aade290f07f43e40d74a62bbdba9393761e4a77ebbcaff9ca1940e

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