Malicious PDF — malware analysis report

Static analysis result for SHA-256 11599f432e10f96a…

MALICIOUS

PDF

88.8 KB Created: 2021-05-18 18:28:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3e0750c648f910c21fc441cba649d4e4 SHA-1: 9f4ec421f440174995e0e621acaa882787df4fea SHA-256: 11599f432e10f96a56e04817c8ae3c589855c79ed841b0673ad2b49884ccdb18
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files, indicating a link farm. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://yafferge.ru/strik?utm_term=how+much+do+psychologists+get+paid+in+australia'. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting it is used for phishing or distributing further malware. No scripts were extracted, but the document structure itself is designed to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=how+much+do+psychologists+get+paid+in+australia In PDF document text
    • https://luzuredero.weebly.com/uploads/1/3/4/0/134016924/6911786.pdfIn PDF document text
    • https://lirupije.weebly.com/uploads/1/3/1/6/131606624/c4d00318984cf0b.pdfIn PDF document text
    • https://xizikako.weebly.com/uploads/1/3/0/9/130969027/musokuli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495973/normal_5fd6746e96948.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383304/normal_6005f4c326273.pdfIn PDF document text
    • https://natitapa.weebly.com/uploads/1/3/1/3/131379406/xifesosa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368219/normal_5fe9269773fef.pdfIn PDF document text
    • https://buwofapakudo.weebly.com/uploads/1/3/5/3/135316190/9c87b74c9d81e49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457006/normal_603f71d7a540f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422144/normal_60112ac007edd.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/jagux/6410626951.pdfIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/26949849231.pdfIn PDF document text
    • https://s3.amazonaws.com/jugobimuraje/25704631402.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11935f2d-2d70-46ef-b5f8-580432d133b5/69950141210.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c5df221-230f-48b7-b1e7-1e37cfbe41e0/17137762007.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c097005c-34e2-42b3-9ef3-43e7c108da68/using_20w50_instead_of_5w30.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/turtle_beach_800x_on_xbox_series_x.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/major_cardiovascular_risk_factors_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f700b60b-3a4b-454d-bda4-53a2a61f3b01/17009204836.pdfIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/shri_krishna_bansuri_dhun_ringtone_free.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/38097011086.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd62ae0c-eb26-4f01-b8f1-8c06889b8cc7/pabapefokapipo.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/electrical_safety_inspection_report.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/gisufebedawipukekakamej.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C6 6440 bytes
SHA-256: 629123bfde0685c5f69bbdd27ec008bde0224d5c30af1dabb990f6ee33ea778e
font_01_sfnt_off000102ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BA 5644 bytes
SHA-256: 1cdb6440a0c33817720edabd2687c9fe9d8a8c5663d3074ff0f2883d4d46e4c6
font_02_sfnt_off000115d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D4 11956 bytes
SHA-256: 1e38bd23df26ba4e215684fd68f2e712b856816d4403510b9241984e391cef22
font_03_sfnt_off00013cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD5 16312 bytes
SHA-256: 531e37f64a2e7dc3bfb257675d9e6c644c7b1597f33ba9a969cd005a7ed65660

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