Malicious PDF — malware analysis report

Static analysis result for SHA-256 b458db59a02ebb61…

MALICIOUS

PDF

81.6 KB Created: 2021-04-03 09:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d173cb0cf5c137c3fc28d05fe4cd9e9a SHA-1: 733cc55a455ed762fb12a04e5320bd32e51958b6 SHA-256: b458db59a02ebb61d00f7a0bc0450bfa377e92b97db32f4edc9821bf7a1a13a1
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a link farm and a critical ClamAV detection for a phishing trojan. The embedded URLs, such as 'https://jottigo.ru/award?keyword=sequoia+pitch+deck+pdf', suggest a lure to phishing or malware distribution sites. The presence of numerous external links, many pointing to S3 buckets with seemingly random filenames, indicates a potential attempt to obscure the true malicious destination or to host payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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/award?keyword=sequoia+pitch+deck+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4498971/normal_603112ec12b9e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378607/normal_600984789056e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409799/normal_603cbfb7d0b13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380229/normal_601fcbcb7385c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483089/normal_604ae470767d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385617/normal_5ff98ea35c34d.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/firigugixujotov/26597505836.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/vcds_18._9_loader.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/why_dont_jehovahs_witnesses_believe_in_blood_transfusions.pdfIn PDF document text
    • https://s3.amazonaws.com/bogijexu/legendary_pokemon_guide_omega_ruby.pdfIn PDF document text
    • https://s3.amazonaws.com/jizubisetebof/kumag.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/que_es_un_lider_carismatico_y_sus_caracteristicas.pdfIn PDF document text
    • https://9e2901ea-5d25-41a5-867c-54d0774c6e48.filesusr.com/ugd/4d0f37_3629c1b66e3943efbab62ea6cd498af0.pdf?index=trueIn PDF document text
    • https://f87ce62f-3d5d-4c42-bff3-2e7d00444551.filesusr.com/ugd/72ed28_c97344937ea8432e8ab0786efde0b40e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gusule/dna_replication_diagram_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/instagram_free_for_pc_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/mozeketazaridedasivopu.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/app_store_not_ing.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_off00010074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10074 5232 bytes
SHA-256: 0139ab3687a882ae80a75da5053420ce1916b7d527ac89175877e86fcf1eb627
font_01_sfnt_off00011247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11247 11564 bytes
SHA-256: 709b44b3caf2710c16146512e107cb225e938fca5a9ec137a5203d301b3e9773

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