Malicious PDF — malware analysis report

Static analysis result for SHA-256 55e79dc4f493afe9…

MALICIOUS

PDF

70.0 KB Created: 2021-01-14 18:46:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b29008d4525fb99b690f1df1f7509ef3 SHA-1: 87eeea1ea319de03c9fdf4abb4032ac9d6130411 SHA-256: 55e79dc4f493afe95890282e5a95fbde7322534c6944625dc3f3b74d5cb66acd
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One of the extracted URLs, 'https://traffnew.ru/123?utm_term=underworld+map+earthbound', is directly referenced in the PDF's metadata and heuristics, indicating a likely phishing or redirection attempt. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://traffnew.ru/123?utm_term=underworld+map+earthbound PDF link annotation
    • https://site-1168239.mozfiles.com/files/1168239/worasode.pdfIn PDF document text
    • https://site-1175722.mozfiles.com/files/1175722/seachoice_79901_electric_rope_cutting_gun.pdfIn PDF document text
    • https://zinikedefi.weebly.com/uploads/1/3/0/7/130740178/3c6c9f9a0d29.pdfIn PDF document text
    • https://latibexuwer.weebly.com/uploads/1/3/0/7/130776356/motuzutis_visisaxa.pdfIn PDF document text
    • https://site-1177303.mozfiles.com/files/1177303/horizon_camera_mod_apk_no_watermark.pdfIn PDF document text
    • https://mirurilusenut.weebly.com/uploads/1/3/4/6/134631679/vufajebosele.pdfIn PDF document text
    • https://site-1166042.mozfiles.com/files/1166042/post_op_hip_replacement_exercises.pdfIn PDF document text
    • https://cdn.sqhk.co/nonuripot/ghOg6ib/lofelakeji.pdfIn PDF document text
    • https://site-1179443.mozfiles.com/files/1179443/kasumisaros.pdfIn PDF document text
    • https://cdn.sqhk.co/xovujiroveg/eZhbrm7/39423608109.pdfIn PDF document text
    • https://cdn.sqhk.co/wezufunin/iiiMbia/kabiponilo.pdfIn PDF document text
    • https://cdn.sqhk.co/tosijoxopum/egjibje/keepsolid_vpn_unlimited_wifi_proxy_with_dns_shield.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/sinadi/gekiluvu.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_off0000d6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F4 5244 bytes
SHA-256: 01560b6b45f6a78562ccaa9a89cdc63a97028233903fb7296503d48240106e1b
font_01_sfnt_off0000e8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A4 10208 bytes
SHA-256: 9ce7ef1205968708d8f53ca70dc9993c753b1feea4f32076e008e6a3438ed6f8

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