Malicious PDF — malware analysis report

Static analysis result for SHA-256 c128be9e9dd3daa7…

MALICIOUS

PDF

121.0 KB Created: 2021-01-14 20:51:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 3396315b4286bfb3fd394bbc9751bcd5 SHA-1: d0dc2da18728bbcc99499071cff14a83c959f021 SHA-256: c128be9e9dd3daa75c1d0f4e5c15ee76247c831f8eaf34aaacf0ec0a9aa757e4
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm designed to redirect users to external URLs, with one specific URL identified as potentially malicious. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URI point towards a social engineering attack to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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/123?utm_term=his+dark+materials+3+pdf PDF link annotation
    • https://wekimede.weebly.com/uploads/1/3/4/8/134862148/nubezopi_movumafu_fagalesi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409602/normal_5f934d7a7ac1e.pdfIn PDF document text
    • https://site-1171987.mozfiles.com/files/1171987/nitro_rc_cars_for_sale_uk.pdfIn PDF document text
    • https://sogegagep.weebly.com/uploads/1/3/4/6/134687839/7871763.pdfIn PDF document text
    • https://site-1173209.mozfiles.com/files/1173209/maths_worksheets_year_5_fractions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387219/normal_5f8f297667eaa.pdfIn PDF document text
    • https://cdn.sqhk.co/kemuxilajig/vC1LggL/cut_it_out_lyrics_flight.pdfIn PDF document text
    • https://cdn.sqhk.co/pivokazi/aijQyij/wonder_pets_save_the_puppy_meta.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369330/normal_5f99a8e6557a6.pdfIn PDF document text
    • https://site-1168045.mozfiles.com/files/1168045/lobev.pdfIn PDF document text
    • https://site-1247868.mozfiles.com/files/1247868/zowarudefeju.pdfIn PDF document text
    • https://site-1178784.mozfiles.com/files/1178784/80477501918.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zulezov/6672306911.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/autocar_india_magazine.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/vatulipiwawagano.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18986 4948 bytes
SHA-256: 1cf0e39198486ad57868608fca278e7e6a3485fdb3c3a22bf338809e7aae23bb
font_01_sfnt_off00019a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A4F 14420 bytes
SHA-256: 6f2112b559f88505c8e6c13d4ebf75aa77598d80bb182290065bc225ebdf8ab3
font_02_sfnt_off0001c857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C857 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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