Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0dd4e0388b707ee…

MALICIOUS

PDF

79.2 KB Created: 2021-03-18 13:11:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: eff189a09defee95888209902deaf66e SHA-1: d543dda60243a6f8e320fa20ae1276a10c856a33 SHA-256: a0dd4e0388b707ee88714a8c0e8eab2616ccf517054f80102205a89702ed6b52
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant portion pointing to disposable hosting and link farms, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are consistent with a phishing lure designed to redirect users to malicious sites like http://instasurprise.online/kizezoru0bn1n.pdf.

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 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://jacksth.ru/123?utm_term=aicte+deemed+university+exam+answer+key+2018 PDF link annotation
    • http://instasurprise.online/kizezoru0bn1n.pdfIn PDF document text
    • http://befotuke.mywebcommunity.org/ornish_diet_menu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451039/normal_603179ad9a0f0.pdfIn PDF document text
    • https://cdn.sqhk.co/sogefuluf/hgcKGbf/76660506773.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuvezosapa/jbkjchf/meridian_point_classic_wooden_four_in_a_row.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480382/normal_5ffd657f1160c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495039/normal_604678daaac0f.pdfIn PDF document text
    • http://netlysy.online/zurich_balanced_managed_ap_fund_fact_sheetr8yyg.pdfIn PDF document text
    • http://manybigs.space/99033177743futuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427267/normal_6001a01a55e94.pdfIn PDF document text
    • http://bapadama.medianewsonline.com/behold_your_mother_tim_staples.pdfIn PDF document text
    • http://uber-global.com/bupejomeruzozekiq6mdg.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/pjbngfO/21328265934.pdfIn PDF document text
    • https://cdn.sqhk.co/piravasufinu/YelijDP/packers_bears_2019_highlights.pdfIn PDF document text
    • https://cdn.sqhk.co/belerudoxej/LMgctjb/zombie_war_movies_2019.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/palevijuj/53415758711.pdfIn PDF document text
    • http://safamulidapi.epizy.com/95828496717.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/unfailing_love_sheet_music_jw.pdfIn PDF document text
    • https://s3.amazonaws.com/wutogugej/canon_vixia_hf_r82_camcorder_review.pdfIn PDF document text
    • http://voronuxo.epizy.com/78992223118.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E4 5948 bytes
SHA-256: 4c59d1c2694b60ad09167d0fd789b293e808bcd81588e692105506bc55fae321
font_01_sfnt_off00010a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A32 10864 bytes
SHA-256: 6e1bfa303ae6fd1088892c9136ee74f46e2d90dd220f774a656b2a4546718f47

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