Malicious PDF — malware analysis report

Static analysis result for SHA-256 2baae492e2e6856c…

MALICIOUS

PDF

81.1 KB Created: 2021-09-09 13:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 29cb216fd6855f1aec85ff39a070a4ec SHA-1: 7018f5c06175dce2aa835d630fd693e1ab8b2346 SHA-256: 2baae492e2e6856c45918049e292c51db638dbcf511b29f29f4446f75a11f007
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. The heuristics reveal it functions as a link farm, hosting numerous links to other PDF files, likely to obscure the ultimate malicious payload. The presence of external URIs and a high number of distinct hosts suggests a coordinated effort to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 http://ankaraeksioglu.com/resimler/files/fomekevapanimuvumunibid.pdf In PDF document text
    • https://airflow-skateboards.com/upload/file/tuzisobadavexipi.pdfIn PDF document text
    • http://labsshop.com/d/files/retanapijura.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-2/20210902191723903085.pdfIn PDF document text
    • https://thehouseproduction.net/file/wugif.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/rovirus.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///tapuzodurof.pdfIn PDF document text
    • https://hgb.se/filer/file/punofefizujiz.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/naxitoxosegogosuvawefizo.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/neluzovidejadamisos.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090210300218.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/79122569341.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/40568340328.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/doumt4suqa94hkgrl56k9v47ls/11187864990.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/fenifilobefukimi.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/24526070733.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396b3290090---gilegipulozojajufatodub.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/mobuxotusojemupin.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/mapamigisivujup.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/nubadax.pdfIn PDF document text
    • https://totounited.com/contents/files/tavekatekulumegi.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/29281903251.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=strobe+tuner+pro+apkPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76D 10344 bytes
SHA-256: 4fd8e9cb5f48de1998fbbd264a28e785b57af6c80eacc2338f4eb44b398d2ff9
font_01_sfnt_off0000eeb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CA 18288 bytes
SHA-256: 984484ac00c6e10a03ba08855caf6fd9f6c360caba31f58492b6b8fedd65c162

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