Malicious PDF — malware analysis report

Static analysis result for SHA-256 95ee6918c439944a…

MALICIOUS

PDF

77.8 KB Created: 2021-03-26 08:02:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 857a3ff6567a359fd7faba839215a16b SHA-1: 5387372c9440c389a876b87428318738e9687d70 SHA-256: 95ee6918c439944a1d981a819c45c210db3ac5863349cea357dca7525d9028ab
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a 'PDF_SEO_LINK_FARM' pointing to suspicious domains like 'semazolowogafoj.22web.org'. The primary external URI 'https://xajibur.ru/wix?keyword=an+introduction+to+mathematical+cryptography+hoffstein+pdf' suggests a lure related to academic content. ClamAV also detected this as 'Pdf.Phishing.Trojan'. The document's structure and link farm indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/wix?keyword=an+introduction+to+mathematical+cryptography+hoffstein+pdf PDF link annotation
    • http://semazolowogafoj.22web.org/sowesenunimawipizenu.pdfIn PDF document text
    • https://cdn.sqhk.co/taduzotul/jgAabVM/domino_effect_meaning_sa_tagalog.pdfIn PDF document text
    • http://lawyer-consult.ru/ambitious_words_to_describe_a_forestrmsxj.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/OtXhjRM/4373124341.pdfIn PDF document text
    • http://shimano-stradic.ru/234561024374st6i.pdfIn PDF document text
    • http://fesadivu.iblogger.org/speak_english_podcast_com_007.pdfIn PDF document text
    • https://cdn.sqhk.co/dozirolizilu/wgghhgj/superbike_racing_calendar_2019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388420/normal_5fc7e35e651db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402938/normal_603ad61fcc81f.pdfIn PDF document text
    • http://xurixekan.22web.org/ada_2019_guideline_update.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/wusone/bewafa_status_video_whatsapp.pdfIn PDF document text
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_460393e313bd476e9b1c2d41a0de87c4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sutawowirosuvuv/313328548.pdfIn PDF document text
    • https://6ba8113a-99dc-4618-97bf-d7180f10ff72.filesusr.com/ugd/b6edda_e15c51f2ee574d3c8d8f71967bf0120b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kufazete/ebook_reader_application.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/jubunowapegifudaji.pdfIn PDF document text
    • https://80172413-d145-4b71-b7cf-4a007d76ad29.filesusr.com/ugd/cacfd7_c260fb92afca4674a56926fb34467fe7.pdf?index=trueIn PDF document text
    • https://15e12281-0fef-4bb1-b284-2b61ddec1698.filesusr.com/ugd/6c5390_92dd9b1efa4343f59cf2196bee2a4d48.pdf?index=trueIn PDF document text
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_f1d0e7f63ca04f53a67c23aeece62130.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/pobexagoditupi.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_off0000f0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0ED 5660 bytes
SHA-256: bafcd737665964eb9ccde3f40d54c4afd8276ce7b5ef0ce238ee70e448ad22e9
font_01_sfnt_off00010411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10411 10840 bytes
SHA-256: 8ceefd142f34924acb374e38dae474786b83a292771184f1651c451dc31eaed1

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