Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b4ecd31647b152e…

MALICIOUS

PDF

90.4 KB Created: 2021-03-24 13:34:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f317aca3b6f0da7b53fae250dcaf16b9 SHA-1: 66b2b20186979dc508275a8f9add3538ff74d671 SHA-256: 6b4ecd31647b152eaf0834069a3d37b6b3cafdc454bb19f930b77013877443c2
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are likely part of an SEO link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the 'Download Now' heuristic further support a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pelibifir.ru/award?keyword=acca+f5+notes+pdf+2020
    • http://spoonnumberone.xyz/dorimevefaxqkadw.pdf
    • https://fadapezak.weebly.com/uploads/1/3/0/7/130775088/3516631.pdf
    • http://com-signto2.xyz/english_grammar_exercises_with_answers_form_2lxjga.pdf
    • https://lilikegemuvil.weebly.com/uploads/1/3/1/3/131398424/8145d6a88b.pdf
    • http://detobusukited.iblogger.org/cricut_gift_box_template_free.pdf
    • http://drive4mclanemilwaukee.com/audiocodes_mp-114_fxo_configurationbvuo4.pdf
    • https://bonesinidojesu.weebly.com/uploads/1/3/4/5/134591006/jupeb.pdf
    • http://cetakchantek.com/vizio_sb3820_c61ylvr.pdf
    • https://cdn-cms.f-static.net/uploads/4501503/normal_6018e6312ebdb.pdf
    • https://cdn-cms.f-static.net/uploads/4462075/normal_603aacd5e5322.pdf
    • https://cdn-cms.f-static.net/uploads/4483589/normal_600bcfbca091d.pdf
    • https://daxuvinu.weebly.com/uploads/1/3/2/6/132695190/zunibap-gigul-mopedewabig-zevabewibik.pdf
    • http://trells.space/what_are_the_key_elements_of_protocolsoi8g7.pdf
    • https://rudabukonavapuk.weebly.com/uploads/1/3/4/0/134016662/5104609.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/legipalofi/misipagu.pdf
    • http://butadiviwev.rf.gd/zofisi.pdf
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_05c8966cb6804c528d83fe4f16bb1655.pdf?index=true
    • http://suvofaga.rf.gd/dijitizosopiv.pdf
    • https://s3.amazonaws.com/dumupa/continuing_healthcare_checklist_template.pdf
    • http://luredavum.epizy.com/how_to_install_eheim_fish_feeder.pdf
    • https://f8e303d0-f350-43d2-b7c3-f886ef13ec25.filesusr.com/ugd/1bb397_e295e876a99548d78ba78e34b782aa0a.pdf?index=true
    • https://s3.amazonaws.com/fadupazageraf/myocardial_infarction_guidelines_diagnosis.pdf
    • https://s3.amazonaws.com/pilazi/hootsuite_2019_digital_report.pdf
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_8c819a8ee79f46079da1ecec1c5a3b4b.pdf?index=true
    • https://cd753cf5-d90a-4073-9c55-931a76e81761.filesusr.com/ugd/8826df_576e60fddb1847008dc2eacd3bd69127.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010326.bin
38a2fed2882027e11dddffb373b2556050ea9ee7f1efe16faa9ef6b33ab54710		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10326 5408 bytes
font_01_sfnt_off000115ab.bin
e9ce0639c26816448c4de94eb238830132b0e9276a8d3d5405941423dbb4446d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115AB 2472 bytes
font_02_sfnt_off0001208d.bin
807aea9a13b7be5760a2eb236f3dcb80e07dc9038042c1f6f6ac29863eddc3fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1208D 10820 bytes
font_03_sfnt_off00014597.bin
dc620336aa769c766927a552749f6283a30952bf3238451f386faf844582b0a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14597 16344 bytes

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