Malicious PDF — malware analysis report

Static analysis result for SHA-256 730a3624029e50a6…

MALICIOUS

PDF

68.2 KB Created: 2020-12-30 14:55:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35f3f359e3c4717e5b6c685f810f1eb9 SHA-1: 189ed88ea26d00aa8dbca194d648ce5e9af4ba47 SHA-256: 730a3624029e50a67b0ac5828751eb4b872fd4ab0a89c3e32dfe935b32ed02bf
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with the primary one leading to a known malicious redirector. Heuristics indicate the document is a link farm on disposable hosting, designed to redirect users to malicious infrastructure. Although no scripts were explicitly extracted, the PDF structure and malicious links strongly suggest an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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.
  • 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://cctraff.ru/strik?utm_term=mini+golf+course+creator+game
    • https://menerixejujup.weebly.com/uploads/1/3/4/6/134605313/ac3db64e2faf0.pdf
    • https://mofumamivuzav.weebly.com/uploads/1/3/1/0/131070192/a99e4dace99dc.pdf
    • https://ravemazezaj.weebly.com/uploads/1/3/4/8/134885195/vasul.pdf
    • https://pikowezapuxo.weebly.com/uploads/1/3/2/6/132681044/sumitojixanuxosif.pdf
    • https://webapifupa.weebly.com/uploads/1/3/4/7/134706955/2580793.pdf
    • https://wumetitazidizo.weebly.com/uploads/1/3/4/8/134885052/b57a40557f.pdf
    • https://cdn-cms.f-static.net/uploads/4378151/normal_5f8c5646600bd.pdf
    • https://feminudusur.weebly.com/uploads/1/3/1/4/131407357/dikejesataro_jojavitidum_monob_fubamad.pdf
    • https://cdn-cms.f-static.net/uploads/4368246/normal_5f9d2bcea34af.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/banula/etiologi_abortus_imminens.pdf
    • https://s3.amazonaws.com/xukonakefules/pokemon_go_download_apk_ios.pdf
    • https://uploads.strikinglycdn.com/files/25f020cb-d950-4c76-8fef-b7159a342351/wogavupodova.pdf
    • https://s3.amazonaws.com/bufipevuril/ponafalefesinalu.pdf
    • https://uploads.strikinglycdn.com/files/bb8a8a17-9263-42a2-ac76-06aff01a4174/48557059353.pdf
    • https://uploads.strikinglycdn.com/files/e8c87f91-513e-42c6-a571-a3091f055901/gobanuromifuve.pdf
    • https://uploads.strikinglycdn.com/files/f81374c7-498f-451f-a92b-0e2db8081260/migufigotawivajilivut.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf94.bin
cf8224e2ffdad787d97fd4c670baab09b3bd9463c23bd5658031bfe63c56ed26		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF94 5208 bytes
font_01_sfnt_off0000e14a.bin
a0be20d5d287fdc9625216a810fa126fa5f81f1f7ad3eb2b1be2821dd9fae7c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE14A 10088 bytes

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