Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6cd31aa888497f0…

MALICIOUS

PDF

76.0 KB Created: 2021-01-11 23:58:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 52ba9ded96e1ac48eac27e5c061e3f25 SHA-1: 24ac69a89f49016616e4286d60d9d321f0da3139 SHA-256: d6cd31aa888497f0e9abc2c7e3a7a4953436828fe8eb8254dc335b2477e97c18
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/aws?utm_term=beanie+weenie+nutrition+information PDF link annotation
    • https://site-1207652.mozfiles.com/files/1207652/nike_windrunner_damen_xs.pdfIn PDF document text
    • https://cdn.sqhk.co/susiwozobo/ccsjhjc/14804047499.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390995/normal_5fba380646d10.pdfIn PDF document text
    • https://rirakivu.weebly.com/uploads/1/3/5/3/135333056/fulosavojufaxem.pdfIn PDF document text
    • https://site-1173983.mozfiles.com/files/1173983/wapapafuzifenifa.pdfIn PDF document text
    • https://cdn.sqhk.co/zawafolor/PLIvejd/ny_company_stores.pdfIn PDF document text
    • https://site-1177329.mozfiles.com/files/1177329/53136264481.pdfIn PDF document text
    • https://site-1083678.mozfiles.com/files/1083678/environmental_law_in_south_africa.pdfIn PDF document text
    • https://site-1172843.mozfiles.com/files/1172843/9539070311.pdfIn PDF document text
    • https://totijavefukaja.weebly.com/uploads/1/3/4/7/134705726/zororuwikab_meledofezota.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417037/normal_5fcaa8a5d1630.pdfIn PDF document text
    • https://cdn.sqhk.co/kabevapixox/miifVjc/xogozidizomanepisap.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/jexijer/62708790078.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/mac_please_define_android_sdk_root.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD697 4728 bytes
SHA-256: 8785cd8228a701e418b070425e74f3c51bacddd225ec9b4cdda3f237e0ea06d6
font_01_sfnt_off0000e694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE694 1940 bytes
SHA-256: 3c8c70e95e172d87f88249f6e98f5fcd1d779dd22b9512bb6276049fa774e71f
font_02_sfnt_off0000efcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCC 10876 bytes
SHA-256: bb2f9b4e198c02d5744d81cafa12d938f99ca41695f04dd84a295534a992aad8
font_03_sfnt_off000114d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D1 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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