Malicious PDF — malware analysis report

Static analysis result for SHA-256 8521df7a887ffd83…

MALICIOUS

PDF

76.6 KB Created: 2021-03-28 08:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c7e0575d29e7311f00f35c016ae9839 SHA-1: b61575fbb0a3412083b9b55ffa331629c8d7d9cf SHA-256: 8521df7a887ffd83e4ed6bc6dd685d4570f8ddb12f3ce62fc9a3ee52220cbac5
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains a large number of external links, many hosted on disposable domains, suggesting an attempt to direct users to malicious content or phishing sites. The presence of multiple external links and the use of disposable hosting are strong indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/123?utm_term=primefaces+showcase++source
    • https://zapamapat.weebly.com/uploads/1/3/0/7/130775391/bejafos.pdf
    • https://dajemegexiri.weebly.com/uploads/1/3/4/4/134492390/vizesu-jasewavure-rikejojegufo-vumoxoporiloso.pdf
    • https://tivofexogi.weebly.com/uploads/1/3/1/3/131398075/ba16f3c943b4.pdf
    • https://losanuritajog.weebly.com/uploads/1/3/4/7/134730792/911a9f5d2.pdf
    • https://luwutike.weebly.com/uploads/1/3/4/5/134518400/fepesixazewidod.pdf
    • http://rejemezurufoveg.mywebcommunity.org/fogasigebolufusigox.pdf
    • http://jidogirikar.mygamesonline.org/cahier_journal_de_l_enseignant_primaire_algerie.pdf
    • http://wijutomotagam.mypressonline.com/lumakerinogafixa.pdf
    • https://kurisakon.weebly.com/uploads/1/3/4/5/134504438/tokamugezisudatuvuja.pdf
    • http://linefesejewug.sportsontheweb.net/cursive_alphabet_writing_practice_worksheets.pdf
    • https://kazikuxixaremu.weebly.com/uploads/1/3/0/7/130738513/ninilesu-wemunovu.pdf
    • http://digovin.getenjoyment.net/activating_seer_anointing.pdf
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/6520464.pdf
    • http://vaxukivum.iblogger.org/ages_and_stages_questionnaire_free.pdf
    • https://vowebaxuzifov.weebly.com/uploads/1/3/0/7/130738870/3646107.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://zokaramizixa.atwebpages.com/jupebuwejekulesaj.pdf
    • http://likewiwojuxus.atwebpages.com/66427150148.pdf
    • http://zopetudivukuka.rf.gd/cursive_alphabet_book.pdf
    • https://uploads.strikinglycdn.com/files/a5234f76-6baa-48e7-8886-8fac61ae6a4e/sadupidifunuz.pdf
    • https://uploads.strikinglycdn.com/files/e6a79518-a787-46f3-88cf-f7228514e545/cbt_anxiety_worksheets.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4a9.bin
46b57d43a2bf59e02848ae5dcd5cd13b2c74c1545612d759eeece405d78ef71c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A9 4876 bytes
font_01_sfnt_off0000e540.bin
154d70492e4f5a96eb7ff7865c28c0ff47c777996498d09665551c592a69c168		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE540 2996 bytes
font_02_sfnt_off0000f190.bin
6f0df2504ffcc05843650da41bc9b977ce056f67dd928bca0d42fc3503c86824		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF190 10964 bytes
font_03_sfnt_off000116b9.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116B9 4324 bytes

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