Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dd20b52a33bb46f…

MALICIOUS

PDF

82.1 KB Created: 2021-01-24 13:24:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 16c7224728792e7f25917b12b275db86 SHA-1: d2d0f1e986147797419f17179853d71039abe6f1 SHA-256: 8dd20b52a33bb46f7dc571543e96e4a9372533c3dc8b32034bc3586d886b54b3
156 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 SEO-farmed, and one prominent URL that mimics a search result for 'swiftkey apk kitkat'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the PDF structure itself is used to host numerous links.

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://traffnew.ru/aws?utm_term=swiftkey+apk+kitkat PDF link annotation
    • http://genoray.pro/87970399115psefb.pdfIn PDF document text
    • https://bebujufexuxiki.weebly.com/uploads/1/3/4/6/134624407/fonapesinawon.pdfIn PDF document text
    • http://itayoga.space/cartographers_heroes_kickstarter0edzp.pdfIn PDF document text
    • http://constructionhouse.info/tumiwububonabaluputad7y7c1.pdfIn PDF document text
    • https://jafobepajimo.weebly.com/uploads/1/3/4/8/134881918/4730139.pdfIn PDF document text
    • http://remontlegko.info/lelopatakaje43737.pdfIn PDF document text
    • http://trudogoliya.online/26524424196pshgz.pdfIn PDF document text
    • http://servicesforsupport.com/sobimulass3ri1.pdfIn PDF document text
    • http://ratubave.22web.org/cells_and_functions_worksheet.pdfIn PDF document text
    • http://fopafinegetob.iblogger.org/riwupabevulizuledu.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/wemupajese/berkeley_group_holdings_plc_annual_report_2019.pdfIn PDF document text
    • http://bopenakonaj.rf.gd/68543590034.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/nvsp._in_form_status.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/29939965389.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/adobe_after_effects_tutorials.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/convert_a_jpg.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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91C 6744 bytes
SHA-256: 0eac1552a6a0cc8d6d43e14f5c157d052ff2bf21460314f67a2c213e0a454e63
font_01_sfnt_off0000fa03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA03 4524 bytes
SHA-256: ade177c7a2dd56dbcefcd4744e9c5054eb9e29e7d614c3b25cf7ff756f6d6b6f
font_02_sfnt_off00010985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10985 10328 bytes
SHA-256: d74d176a29ab7cb14b1692c5dee92e3d080fbb4f0973e3813f4c80a67be61610
font_03_sfnt_off00012c8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8E 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

Open this report in the interactive analyzer, or submit your own file for analysis.