Malicious PDF — malware analysis report

Static analysis result for SHA-256 8deacfc776b812ea…

MALICIOUS

PDF

73.1 KB Created: 2021-03-28 05:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4d3b62dc21826cd4c292134ed9d0fa2d SHA-1: b080dea7204de60b3a9ad3c9dd1cad40bde21727 SHA-256: 8deacfc776b812eae47c77bcce12ba952d717c5519bbae5c9bdd97c98482fae1
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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://crophysi.ru/wix?keyword=sin+cos+tan+ratios+worksheet PDF link annotation
    • https://fixasamajiwige.weebly.com/uploads/1/3/4/3/134318971/fb6d8ccf3af.pdfIn PDF document text
    • https://sifudalumavobu.weebly.com/uploads/1/3/2/3/132302711/2341307.pdfIn PDF document text
    • http://pexukakadom.22web.org/satibovibomofobov.pdfIn PDF document text
    • http://ninefuva.22web.org/42370889476.pdfIn PDF document text
    • http://fudoviwil.mywebcommunity.org/90473731819.pdfIn PDF document text
    • https://nojemalof.weebly.com/uploads/1/3/0/8/130873850/7688516.pdfIn PDF document text
    • http://tafuxasomup.getenjoyment.net/eleanor_and_park_summary_no_spoilers.pdfIn PDF document text
    • http://fubikopelemom.mypressonline.com/curso_de_marketing_digital_online_gratis_com_certificado.pdfIn PDF document text
    • https://nigakanal.weebly.com/uploads/1/3/4/5/134527226/dexajat-judidapovub.pdfIn PDF document text
    • https://tivepikilusu.weebly.com/uploads/1/3/4/7/134759048/7380777.pdfIn PDF document text
    • https://nofakuxuwuxow.weebly.com/uploads/1/3/4/6/134684799/biwefafinuxa.pdfIn PDF document text
    • https://penogefuf.weebly.com/uploads/1/3/2/7/132740618/tofugivapemad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xelidamos.epizy.com/91348765033.pdfIn PDF document text
    • http://lodufuvu.epizy.com/android_ndk_sample_method.pdfIn PDF document text
    • http://pidegesuwi.epizy.com/75611830871.pdfIn PDF document text
    • https://s3.amazonaws.com/mujesogi/18951969812.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/sonapunalibutoliwu.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/derupajojikagopopamu.pdfIn PDF document text
    • http://bobitemobo.epizy.com/11896774042.pdfIn PDF document text
    • http://kiwusegofavuto.rf.gd/aashiqui_2_mashup_song_bestwap.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/dumixijezamavadurolaz.pdfIn PDF document text
    • http://tipofib.rf.gd/tejulukuxorubulelemim.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08D 5112 bytes
SHA-256: f028b0f40befb96fe3b2a55cf0647caf71c392c66bc24d888c49cba1180af04c
font_01_sfnt_off0000f202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF202 10908 bytes
SHA-256: c623270f38c84936a9a5a05b8da7799468e86ea2e3ed71aad03c63bfe05b12d0

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