Malicious PDF — malware analysis report

Static analysis result for SHA-256 aefff2697777b759…

MALICIOUS

PDF

75.6 KB Created: 2021-05-04 02:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 355bd95ccd157d2bddfd1024b7e2b95f SHA-1: 92d6f94766c9808f46cb6c69976067473db44301 SHA-256: aefff2697777b7597b39dd53bbd63cbf9d22d85ac2cf59130b2384eab921c508
186 Risk Score

Malware Insights

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

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 6

  • 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 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.
  • 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://fokemale.ru/strik?utm_term=how+does+emdr+work+for+complex+ptsd PDF link annotation
    • http://kedamijofulufep.mygamesonline.org/667742413.pdfIn PDF document text
    • https://gakezepatirana.weebly.com/uploads/1/3/2/7/132712251/polubu_fojigomisiviraj.pdfIn PDF document text
    • https://sifuparara.weebly.com/uploads/1/3/4/3/134352995/1455605.pdfIn PDF document text
    • http://com-signto2.xyz/lozonapijafisevil7mvn5.pdfIn PDF document text
    • http://kigetipopizatij.getenjoyment.net/44734202379.pdfIn PDF document text
    • http://tozofuji.scienceontheweb.net/vasisasevidimo.pdfIn PDF document text
    • https://vafuzetok.weebly.com/uploads/1/3/2/7/132740798/dazanavelekalafedo.pdfIn PDF document text
    • http://cetakchantek.com/whatever_tickles_your_pickle_phrase_meaningfn5cs.pdfIn PDF document text
    • http://xuxetosufuzo.getenjoyment.net/itsy_bitsy_spider_easy_piano.pdfIn PDF document text
    • http://pajuwepubawip.sportsontheweb.net/english_words_with_synonyms_and_antonyms.pdfIn PDF document text
    • http://dilawiputonu.mypressonline.com/97941456856.pdfIn PDF document text
    • http://joy-todays.online/lexmark_ms310dn_drum_unithfdpg.pdfIn PDF document text
    • http://brumbum6.xyz/20047665576qmsj4.pdfIn PDF document text
    • https://nebowepef.weebly.com/uploads/1/3/4/4/134483035/3382891.pdfIn PDF document text
    • http://juraxoxodas.scienceontheweb.net/ketuwo.pdfIn PDF document text
    • http://repizedozoful.sportsontheweb.net/cotton_eyed_joe_banjo_tab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c6111751-42b6-464f-a8b1-832d492ff999.filesusr.com/ugd/3d0627_ca90a260c06d49748d1e50c5a8c99992.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/school_bully_pc_game_free.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/thrawn_comic_book_online.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/where_can_i_watch_harry_potter_movies_in_order.pdfIn PDF document text
    • https://fb413987-6e77-4bf1-aaa6-e97eb550fbee.filesusr.com/ugd/108936_0ca1b219613a4991bc94fb0828dcdb3e.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_off0000eaed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAED 5276 bytes
SHA-256: 7c3a88d82f0c548ab9b062737140e3830a5f0753d21e0d89c4cc13eefe353a0f
font_01_sfnt_off0000fce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE4 10520 bytes
SHA-256: f5659751244bf3b95c56df25cf32a64f9a2a2dd0e830cbb4183afcef31dc5b0d

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