Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e7d0ac08702dc61…

MALICIOUS

PDF

74.0 KB Created: 2021-02-21 02:41:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 086c79f8638ec358472ceceab97a064e SHA-1: 5bf02e75731a5a1cc4899734b4b223d454887831 SHA-256: 2e7d0ac08702dc619d82e963ba29828a9b32eb4ead47ba402d1dcf75e5a5bddf
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to contain metadata related to the 'Robert yin case study research design and methods 5th edition', likely a pretext to disguise the malicious links.

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://jottigo.ru/123?utm_term=robert+yin+case+study+research+design+and+methods+5th+edition PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4488807/normal_60161199527ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452161/normal_5fc9380edd1a0.pdfIn PDF document text
    • http://sodaapp.pro/68712299642nbt4m.pdfIn PDF document text
    • https://cdn.sqhk.co/zunezafi/dhjhehj/xirizaxokivuxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500878/normal_600efff51c60a.pdfIn PDF document text
    • https://cdn.sqhk.co/bimonabozo/bjcgehd/gulidulogatexutim.pdfIn PDF document text
    • http://betmoy57.com/1693287873516z85.pdfIn PDF document text
    • http://wildboost.club/here_i_am_lord_scripturefz6mb.pdfIn PDF document text
    • https://cdn.sqhk.co/lelogivotosu/cVhahiN/skate_space_198.pdfIn PDF document text
    • https://cdn.sqhk.co/zolulesar/PAiahiH/marco_s_pizza_nutrition_large_pepperoni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391008/normal_601b858a87439.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459630/normal_5feb68a61b6e1.pdfIn PDF document text
    • https://cdn.sqhk.co/lenawemijixe/IhRxhbF/assistive_touch_screenshot_ipad.pdfIn PDF document text
    • https://cdn.sqhk.co/bipozipo/mUjfcha/96062719075.pdfIn PDF document text
    • http://legendbilisim.com/wasonivojubotujj8qv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487618/normal_5fd338390617d.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/kubedukowug/pevudonojubavatirajanome.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/rearrange_bookmarks_firefox_android.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/aimp_android_skins.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/scientific_notation_worksheet_8th_grade_answers.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_off0000e2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B9 5692 bytes
SHA-256: 9e87ccbe9194c3a596d2c6d8f06525b166af04c5f424b9966edef0ec29191b45
font_01_sfnt_off0000f5fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FE 10520 bytes
SHA-256: dd9756bedcd3c16f7532410ff9d24f520626a57c4b536d6e167add7690aeb8b2

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