Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91e4b955920995a…

MALICIOUS

PDF

78.6 KB Created: 2021-03-22 22:48:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 92559825a4dc354b17b1393227a21365 SHA-1: 43a987d03290c6c5154bdd76177818bffd45d980 SHA-256: d91e4b955920995ac4162acd5bb78e02bae71ee9d0358783da9bd12a1de3d41c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to manipulate search engine results. One prominent URL, 'https://leonvi.ru/wix?keyword=how+are+dogcatchers+paid+math+worksheet+answers', suggests a phishing or scam attempt disguised as educational content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/wix?keyword=how+are+dogcatchers+paid+math+worksheet+answers PDF link annotation
    • http://birapemotafew.mygamesonline.org/learn_python_3_the_hard_way_quora.pdfIn PDF document text
    • https://jagusidenoz.weebly.com/uploads/1/3/4/9/134902343/d3a88457d.pdfIn PDF document text
    • https://cdn.sqhk.co/zarejesorufo/Tx4rpjg/thorogood_boots_for_sale_australia.pdfIn PDF document text
    • http://xuxetosufuzo.getenjoyment.net/jenusis.pdfIn PDF document text
    • http://tuxosuzarug.iblogger.org/37711988859.pdfIn PDF document text
    • https://zamomojufowa.weebly.com/uploads/1/3/4/6/134613680/gobida.pdfIn PDF document text
    • https://zajavaka.weebly.com/uploads/1/3/5/3/135322154/9365000.pdfIn PDF document text
    • https://fugomunufu.weebly.com/uploads/1/3/4/5/134586131/9465716.pdfIn PDF document text
    • https://cdn.sqhk.co/vofonowul/OqWhjpI/disordered_proliferative_endometrium_treatment.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vuxagixil/vizibupizawomopubovipa.pdfIn PDF document text
    • http://xewebumobodoris.rf.gd/nopuzemowavewaxon.pdfIn PDF document text
    • http://widifusi.myartsonline.com/vinogunilewu.pdfIn PDF document text
    • http://tizexazebubo.atwebpages.com/venoduko.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/12358052620.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/proxy_vote_form_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/namape.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/kamajavevonomo.pdfIn PDF document text
    • http://jadupapobixe.epizy.com/what_makes_a_good_common_app_essay.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/thirteen_colonies_map_activity_answers.pdfIn PDF document text
    • http://mumuvovowoxoje.epizy.com/beveridge_report.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/nj_transit_child_fares.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_off0000ead2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD2 5360 bytes
SHA-256: 351934cbd6874accf8dd60e761ad6e74fadb316e1710f286e79e3c767bed2804
font_01_sfnt_off0000fcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF6 9888 bytes
SHA-256: 9048d6f5a1d8c4601d8938f47fb818908d00ef9af2c1875d0a5f2983bc7781c5
font_02_sfnt_off00011e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E90 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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