Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c7a052a33983af2…

MALICIOUS

PDF

68.9 KB Created: 2020-11-17 15:51:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: b15d40b8a6a1300ad9edee5cede93c46 SHA-1: de81ad1f4c02c1f145b0eaacce7889aa91c7af75 SHA-256: 3c7a052a33983af233a4436dc037a9654f67a1b76391268ecefe2a229962b0f5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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 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://trafficel.ru/strik?utm_term=haritada+kaybolmak+sorular%25C4%25B1+e%25C4%259Fitimha PDF link annotation
    • https://gejatovuri.weebly.com/uploads/1/3/1/4/131406669/bezije_gebapimana_pibiserila.pdfIn PDF document text
    • https://vokugekezigak.weebly.com/uploads/1/3/4/5/134592112/gunerulo-todakorudabafos-falekiv.pdfIn PDF document text
    • https://buveziketi.weebly.com/uploads/1/3/1/3/131398526/pogozagipoz-limazonivarinin-litexexakokabod-zalasudawaragur.pdfIn PDF document text
    • https://netaluzubik.weebly.com/uploads/1/3/0/8/130813777/f31fe8.pdfIn PDF document text
    • https://wijizavop.weebly.com/uploads/1/3/4/3/134309393/vonesa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421354/normal_5f9d2ca11ab68.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/aac5b8a6-e4fa-4dd3-9c29-e5e6594857a6/28352248504.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbce78be-f248-4dd3-b935-9c7fb061f63f/chucks_southern_comfort_cafe_menu.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/phim_kiem_hiep_hong_kong_hay.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/le_besoin_de_fond_de_roulement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f74ff77-2b3f-4460-b6b3-9bde77cc6a30/72648554080.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/27971417863.pdfIn PDF document text
    • https://s3.amazonaws.com/nopomewegobij/amphitryon_38.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/xaguwajobal.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_off0000cd84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD84 5596 bytes
SHA-256: a9c0bc61fea8a623af6d1ad0690665f30b69a67944d5fd1184f5e0f96c17ab99
font_01_sfnt_off0000e063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE063 11724 bytes
SHA-256: bfc380165c539c28679d7ce8b3d2284dfe7559790737d734f4ca859b4171ef7a