Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab40ce16f44025a2…

MALICIOUS

PDF

81.7 KB Created: 2021-02-15 05:52:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f5a6dc56ab0792e16502f8faee8f6d1e SHA-1: 9502864e59508ffccfb591c1545899316f9f29a1 SHA-256: ab40ce16f44025a28ba2d26be7cb13486db4f3b37cdb16b274f6cf473900fd46
244 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics as a malicious redirector and a link farm, indicating its purpose is to lead users to external, potentially harmful, content. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the sheer volume of embedded URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://crophysi.ru/123?utm_term=spencer+daily+reporter In PDF document text
    • http://zoom-omsk.ru/vejedezhank.pdfIn PDF document text
    • https://boxijobanopuvob.weebly.com/uploads/1/3/0/7/130739783/191ddd62472cebf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406482/normal_600de4d85f38b.pdfIn PDF document text
    • http://nnorm-id.com/analytic_geometry_word_problems_with_solutions7qptv.pdfIn PDF document text
    • https://cdn.sqhk.co/xodakebebit/fhfgfc5/vofamukivesakuxakatotepu.pdfIn PDF document text
    • https://cdn.sqhk.co/sejejajoxej/gcZmjdZ/download_the_escapists_2_pocket_breakout_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481275/normal_5ff2ba8bd8947.pdfIn PDF document text
    • https://cdn.sqhk.co/fedelubu/jdhfijm/nuditafefuzojujaz.pdfIn PDF document text
    • https://radugimexeb.weebly.com/uploads/1/3/4/8/134880062/vaninifuluvepipo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374369/normal_5fd34d4d0d3d2.pdfIn PDF document text
    • https://robivobaxo.weebly.com/uploads/1/3/0/8/130873737/dac430e1452a94.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/uhfifih/17624815958.pdfIn PDF document text
    • http://nashremont.site/snesdroid_shaders_downloadvlmep.pdfIn PDF document text
    • https://mimasalidapu.weebly.com/uploads/1/3/4/4/134466186/08b1fae58.pdfIn PDF document text
    • https://cdn.sqhk.co/gukisafuw/ie9gejg/tisegebodig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416656/normal_5fe7a1e581aaf.pdfIn PDF document text
    • https://xududegugi.weebly.com/uploads/1/3/1/6/131636960/fezelesogip.pdfIn PDF document text
    • https://cdn.sqhk.co/jiguluzufuwa/fGSiiid/69960503619.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473384/normal_5fff03833fe9c.pdfIn PDF document text
    • https://fitinunajixir.weebly.com/uploads/1/3/1/6/131637477/fomikuxesojixax_sikodosamod_jamarasitafete_vofizix.pdfIn PDF document text
    • https://xiduzejeg.weebly.com/uploads/1/3/1/6/131606953/677646.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00010340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10340 5092 bytes
SHA-256: f8d89ad16ca82ca28c4aa7e0f3b698cb9e1013e4af4aa09f87d0d58a33be4934
font_01_sfnt_off000114ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AB 10812 bytes
SHA-256: b12fbd42e9d40f7eff7f206c78370b0f965c30e3fa42ce73e13c7f3fe0fce479