Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6979fd9c9db5c9d…

MALICIOUS

PDF

81.3 KB Created: 2021-03-20 23:04:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8bc7a2337d9c3fd400332ff7c6419078 SHA-1: d9a7756ce091a0a4a0635364c6168a9b349c1842 SHA-256: d6979fd9c9db5c9d889295f7b28ef813438f8fede970ba42b08473fda17ee303
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to disposable domains or link farms, indicating a phishing or malware distribution attempt. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of external URIs and the link farm heuristic strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://leonvi.ru/strik?utm_term=how+to+clean+holmes+oscillating+tower+fan PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465935/normal_60481778ab077.pdfIn PDF document text
    • http://kofojoxake.mygamesonline.org/13643257779.pdfIn PDF document text
    • https://xavixevoke.weebly.com/uploads/1/3/4/5/134590279/277c75cdc3aae.pdfIn PDF document text
    • http://ecosbor.net/amazon_books_the_jane_austen_societypex5s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455901/normal_60087f85ecde7.pdfIn PDF document text
    • http://xutifufaxe.mypressonline.com/totomivivi.pdfIn PDF document text
    • http://limelusefi.iblogger.org/89975375089.pdfIn PDF document text
    • http://warajuvevuv.medianewsonline.com/how_to_be_even_better_manager.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469850/normal_600816a9672ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501229/normal_5fcd099578a99.pdfIn PDF document text
    • https://xeziguga.weebly.com/uploads/1/3/5/3/135392729/karopemurelepizu.pdfIn PDF document text
    • https://migaxodilex.weebly.com/uploads/1/3/4/8/134852634/vesev_babem_rirawanupab.pdfIn PDF document text
    • http://gubixazolela.sportsontheweb.net/ravewitiwetobevuvor.pdfIn PDF document text
    • http://vipmanmarket.space/feravagijomujefazezuditagniahp.pdfIn PDF document text
    • http://study-english-05.site/easy_80s_music_quiz_questions_and_answerswasf9.pdfIn PDF document text
    • https://fikenetefi.weebly.com/uploads/1/3/4/7/134771518/5776907.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fobiwuna.epizy.com/bobijujejenopekogod.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/72123354719.pdfIn PDF document text
    • http://bitugoxopezuwu.rf.gd/checkers_apk_game.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/free_smadav_antivirus_2017_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/marvel_movies_in_order_to_watch.pdfIn PDF document text
    • http://rizivubonulej.atwebpages.com/whos_afraid_of_virginia_woolf_full_movie_free.pdfIn PDF document text
    • http://sogakusepululir.epizy.com/formule_du_sulfate_de_sodium_solide.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_off0000ffdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDD 5348 bytes
SHA-256: baba4bad0bb0f9144c4b104e07b9eac63c8c3dc4f226bc51232b5f5a58d424dc
font_01_sfnt_off000111f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F3 11108 bytes
SHA-256: bf2a9ef3f69861d342352fd36bfe8d5a7ed816c6260165cb7b8ee58a543cfd3b

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