Malicious PDF — malware analysis report

Static analysis result for SHA-256 4567620efbb1a654…

MALICIOUS

PDF

78.5 KB Created: 2021-01-15 03:43:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 1c7578a362d4d27a04d5b0fc9d4d8762 SHA-1: 7d59274f90a17f157cb5f888aedbca3bcdfcdb21 SHA-256: 4567620efbb1a6543d39c74b5b3084bf05ad3d8e9854ce9891039aa7cbc48417
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://trafftec.ru/123?utm_term=hay+pauncefote+treaty+apush+definition PDF link annotation
    • https://beritugemob.weebly.com/uploads/1/3/4/3/134332724/1352832.pdfIn PDF document text
    • https://site-1174259.mozfiles.com/files/1174259/immunization_consent_form_template.pdfIn PDF document text
    • https://xonufixusunex.weebly.com/uploads/1/3/4/6/134610533/34aeeddab002.pdfIn PDF document text
    • https://cdn.sqhk.co/tinipuded/DjgAhhb/95240711675.pdfIn PDF document text
    • https://fekukutetixamam.weebly.com/uploads/1/3/4/6/134636283/wosopituzefo.pdfIn PDF document text
    • https://gedesinikus.weebly.com/uploads/1/3/5/3/135323437/noxuliji-gebidewi-nuvelusaxafe.pdfIn PDF document text
    • https://site-1210468.mozfiles.com/files/1210468/target_promo_code_for_baby_registry_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/ihHyPgg/real_snow_slopes_uk.pdfIn PDF document text
    • https://voxivunesiru.weebly.com/uploads/1/3/1/4/131407918/2682509.pdfIn PDF document text
    • https://piwutevuxave.weebly.com/uploads/1/3/4/8/134891910/bufagufebirino.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475217/normal_5ff68a2af012c.pdfIn PDF document text
    • https://site-1217012.mozfiles.com/files/1217012/fabir.pdfIn PDF document text
    • https://bavopasivivewid.weebly.com/uploads/1/3/0/7/130738836/zawomafa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF662 5272 bytes
SHA-256: eb553de34e92f95610c2fa43f5c25f68e66e7f27e149d09031e4115a4bdb9237
font_01_sfnt_off00010854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10854 10856 bytes
SHA-256: d1aad3406cf745f7f7361004f77ea882204e3030408446b1ee2bb0baae608246