Malicious PDF — malware analysis report

Static analysis result for SHA-256 511cbee41b6028a2…

MALICIOUS

PDF

79.5 KB Created: 2021-04-24 15:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c8e72d273330e06ec742af561333d37 SHA-1: d1d88f4de135b08b164a451476efb0ab8a69523c SHA-256: 511cbee41b6028a2e26fb80bbbf722e0c2c276d522cd4454772758f6af6d5d67
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document functions as a link farm, presenting a lure about resetting ASUS router settings to encourage users to click on numerous external URLs. The presence of a password-protected archive lure suggests an attempt to bypass security scanning by encrypting a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://dugedepap.ru/strik?utm_term=how+to+reset+asus+router+to+default+settings
    • https://ninisezidopif.weebly.com/uploads/1/3/5/3/135391617/4579608.pdf
    • http://lowusonuraku.mygamesonline.org/roliriragalowokozumanike.pdf
    • http://zutatowatipo.mywebcommunity.org/talk_about_yourself_example.pdf
    • http://tozemudezajif.mygamesonline.org/ssc_maths_algebra.pdf
    • https://cdn.sqhk.co/pulurune/fegiWid/kixafibanevu.pdf
    • https://pawunotapi.weebly.com/uploads/1/3/1/4/131408062/tajal_kinubidizataku.pdf
    • https://cdn.sqhk.co/mafowixodi/ehiaigd/2613405565.pdf
    • https://gitinegu.weebly.com/uploads/1/3/4/6/134648864/joratufara.pdf
    • http://nurokojo.mypressonline.com/loweze.pdf
    • http://wugumonisukanib.sportsontheweb.net/88110382959.pdf
    • https://cdn-cms.f-static.net/uploads/4367951/normal_60307aaedb407.pdf
    • https://boxuxalido.weebly.com/uploads/1/3/0/8/130814411/nanuvigexi.pdf
    • https://cdn.sqhk.co/xujurovemu/gjHigCk/55962787846.pdf
    • https://furamakivagoj.weebly.com/uploads/1/3/0/8/130814247/pubetitolitug-kazojuzoru-poxugut-tarami.pdf
    • https://cdn-cms.f-static.net/uploads/4488574/normal_602a84c806eab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://5c3e38fa-bf2d-4cda-bfdc-19e9a39f2227.filesusr.com/ugd/b3ada4_0d6ea2b670894f5a8a26169f4869c7d5.pdf?index=true
    • http://tososite.onlinewebshop.net/psychology_file_in_tamil.pdf
    • https://68e1e3d4-268d-49bc-a8aa-b119cb10fea7.filesusr.com/ugd/3ceeb9_64651911427d4d03b59dfdc291f66bde.pdf?index=true
    • https://f270a619-8d23-4dc9-95fa-a4320df4b75e.filesusr.com/ugd/7bd364_1b2524ebec954d4889b553c044804b51.pdf?index=true
    • http://gudugapapilile.atwebpages.com/66809950415.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec52.bin
9f58b08eeb087145dd83f8a2383ff8a5780d7783c321edf149f14d177d84944a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC52 5008 bytes
font_01_sfnt_off0000fd76.bin
8c4a970f2795840e3cac9bc2c074b8a839a34035aabfd0b7809414c29c6021ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD76 10772 bytes
font_02_sfnt_off00012266.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12266 4324 bytes

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