Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca8c03de8a24cbb…

MALICIOUS

PDF

70.1 KB Created: 2021-02-28 09:39:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 07a7c397f18ca7a088d237cea534fa76 SHA-1: 1dc4ae49e57381131c70e81b37215841f0d6110a SHA-256: aca8c03de8a24cbbfe71ce420cf1c5e5f190bdef4b3358444b38b219dff87498
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDF documents, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://kuzutuzo.ru/wb?keyword=curriculum%20vitae%20vs%20resume%20australia PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4475219/normal_60033b429526c.pdfIn PDF document text
    • https://cdn.sqhk.co/zupisopad/8SLhpjg/shooting_world_gun_fire_app.pdfIn PDF document text
    • http://123dutch.com/mixed_present_tenses_exercises_with_keycqale.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490380/normal_5ff10d5ae552b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366630/normal_5ff7112501ef8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380210/normal_6008fcd6cadb1.pdfIn PDF document text
    • http://xumarageli.22web.org/19001943414.pdfIn PDF document text
    • https://jazemajotejavux.weebly.com/uploads/1/3/2/6/132681398/8180005.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392453/normal_6016ab214518a.pdfIn PDF document text
    • http://itanah.space/college_algebra_placement_test_sample_questionsc8jt6.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwolupenilu/iVuOjaF/zebodipe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tufeguji.epizy.com/how_to_determine_wholesale_pricing_for_baked_goods.pdfIn PDF document text
    • http://sonowodiguvab.epizy.com/what_is_the_latin_word_for_tattoo.pdfIn PDF document text
    • http://xoxiposewarewa.epizy.com/kiloxufasiridarur.pdfIn PDF document text
    • http://lexobodigoke.epizy.com/11125346559.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_off0000d6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C9 4912 bytes
SHA-256: fd8df232656b82f1fcf6887db28f8de7b827275362aaeb38a6f6296aa347daf2
font_01_sfnt_off0000e763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE763 10672 bytes
SHA-256: 71c806f25d56acae2fe0a3b45ed167a4ae135db2c82d5dcddcd3d54992e719f0

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