Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6c8b2683b5c5cdd…

MALICIOUS

PDF

79.6 KB Created: 2021-03-20 03:03:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7d3891af0cac46a7a90cbe81fa1b3b82 SHA-1: 19b38d48f594ab5bc513fa8c02309c90a07ddd05 SHA-256: c6c8b2683b5c5cdd864cce0bb69544f2d3029e3fa4f2e9bbf92333e148e42447
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9990

Heuristics 5

  • 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.
  • 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://jacksth.ru/wix?keyword=cpctc+worksheet+answers PDF link annotation
    • http://azakalaza3.xyz/xodomumawehjzy2.pdfIn PDF document text
    • http://puzexijabin.mypressonline.com/45437147085.pdfIn PDF document text
    • http://retys.fun/fapugiliwakikawu9sgst.pdfIn PDF document text
    • http://safetymirrors.xyz/napoleon_hill_16_laws_of_success_youtubed15gq.pdfIn PDF document text
    • http://storeplus.pro/cisco_linksys_e2500_range_extendernxe9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426828/normal_60494b5991bb1.pdfIn PDF document text
    • http://vowujebotoza.mywebcommunity.org/23755997450.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427268/normal_5fd04948da6bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370087/normal_6035a41f9a45e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471692/normal_603ec0a047cbd.pdfIn PDF document text
    • http://drenajkrasnodar.ru/9243566028yzbih.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366055/normal_60261622d398f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372382/normal_6027ca3eae413.pdfIn PDF document text
    • http://kofupum.mygamesonline.org/beatles_free_sheet_music.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388424/normal_5ff8b7ca19ef2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/vezekewivag.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/rovawiketesolafamuzekiwa.pdfIn PDF document text
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_1590b125477849a8ac59d1ac34ed0fec.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/genedesowul/salebuwojokarak.pdfIn PDF document text
    • http://retiziwo.myartsonline.com/3298027503.pdfIn PDF document text
    • https://5b949be5-44ef-49af-96c7-0ebaa8fe632e.filesusr.com/ugd/3402b1_c44aa19dc50741f69f0b9b96cb635f68.pdf?index=trueIn PDF document text
    • https://8ed7ad90-0d0e-491f-9c15-1f6cd5a61d18.filesusr.com/ugd/f1a804_fc7c8658f90a4f3ea105d0dd695b5de7.pdf?index=trueIn PDF document text
    • https://83372c7a-1065-4b07-8284-b64562b46e84.filesusr.com/ugd/035489_6b388a92865f4c89b5cbfd3642bd94de.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/job_interview_answer_weaknesses_strengths_question.pdfIn PDF document text
    • https://91313464-3f42-441e-b0e8-b27065d471ad.filesusr.com/ugd/ee9d3f_df6c0ac367e1449881975f7747399ed1.pdf?index=trueIn 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_off0000fadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADD 5048 bytes
SHA-256: f251afcf1eee3eefc0a7c332f049f509bc6ce8cc5e13d1ba42f15c5eda1096fc
font_01_sfnt_off00010c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C12 10828 bytes
SHA-256: 9ffd56f52d2f9948758a2283d712998a86314e429e6ff612c1bd965b0f06d098

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