Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b1d71834a64cd1d…

MALICIOUS

PDF

77.0 KB Created: 2021-05-12 09:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: defb31dd069bbf3c676dacefc1a98829 SHA-1: 4c6dcb617ec83659302ecfc9c7e071aa34475b99 SHA-256: 4b1d71834a64cd1d7603d522fed342b7661440d752d602da0524f361453cf7c8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicative of a link farm or phishing attempt, and was flagged by ClamAV as a phishing trojan. The embedded URLs, such as https://midufefew.ru/strik?utm_term=how+to+reset+svc+tire+monitor+pontiac+g6, suggest a lure to a malicious site. The presence of PDF_SEO_LINK_FARM heuristic further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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.
  • 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://midufefew.ru/strik?utm_term=how+to+reset+svc+tire+monitor+pontiac+g6 PDF link annotation
    • https://tifedagarowab.weebly.com/uploads/1/3/4/6/134641562/kodemokawanoga-pupaderukixotug-fasaxise.pdfIn PDF document text
    • http://pifedalune.medianewsonline.com/asean_member_states.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465387/normal_6035ae3d42949.pdfIn PDF document text
    • https://jaragamonobuwuf.weebly.com/uploads/1/3/5/3/135346236/572181.pdfIn PDF document text
    • http://kedozupo.iblogger.org/appreciation_letter_for_good_work.pdfIn PDF document text
    • http://kakafeg.scienceontheweb.net/definisi_apgar_score.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417536/normal_5ffa8b7464bbf.pdfIn PDF document text
    • https://logazimakopaw.weebly.com/uploads/1/3/4/3/134399250/wixamo-wujimoz.pdfIn PDF document text
    • https://tisikifa.weebly.com/uploads/1/3/4/6/134614219/wevusexetu_wokixawuvotol_wuxadutaxopowu_welijexojo.pdfIn PDF document text
    • http://tidirakozodawon.getenjoyment.net/antenna_theory_wiley.pdfIn PDF document text
    • https://nenafusorez.weebly.com/uploads/1/3/1/4/131453248/4df8d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xarozitapakegur.epizy.com/gexixoxifolovopim.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/winabinesavenakemugigadeb.pdfIn PDF document text
    • https://ec8c99fd-5413-4e38-b6a0-2ccbba71fc6f.filesusr.com/ugd/de02f3_2c2e25f7e29c4f2abf06206bfdb82f63.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zamuriza/sita_ict_bursary_application_form_2019.pdfIn PDF document text
    • https://b56e00ce-d729-42e9-814b-b9a4b194f5ba.filesusr.com/ugd/f6f93f_12bc8db517714b30bdbdf126b09622bb.pdf?index=trueIn PDF document text
    • https://89e38ec3-4f9a-4901-8333-056bfd5bbc5c.filesusr.com/ugd/3df7a3_db5f30761ff84cd48c3f774565dc916d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ratixifo/vcenter_server_6._0_for_windows.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/bretagne_map.pdfIn PDF document text
    • http://fakulolipokate.epizy.com/what_is_the_word_availeth_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/purevpn_apk_for_android_tv.pdfIn PDF document text
    • http://jezevenakos.myartsonline.com/sindrom_asherman_adalah.pdfIn PDF document text
    • http://zabazajalugawez.epizy.com/divuxugosomusinim.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33F 2900 bytes
SHA-256: b3dfb2f2c41da7350fc3755141d2fd0ea5796bb125df25fec831093623ff73df
font_01_sfnt_off0000ed82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED82 5488 bytes
SHA-256: 842ac689786bc578066997538201019c8d1e1ee5f759abd910ffa7a25940466a
font_02_sfnt_off00010031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10031 11272 bytes
SHA-256: d55fc5f31b9fcdfefc1a354b79fffb9285a83c3cca02826d85784b281548cbe4

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