Malicious PDF — malware analysis report

Static analysis result for SHA-256 261114407ca21180…

MALICIOUS

PDF

73.4 KB Created: 2021-03-29 15:19:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77e78d2df4c24e2171ccf0c9cc5a4187 SHA-1: 3d400dcf4432b3f7e525cfd742ebff3b9b549067 SHA-256: 261114407ca2118048134dd4cf24aae15621b058f7363dc8e71c9b8e809a14a2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing lure, likely attempting to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jottigo.ru/award?keyword=global+marketing+pdf+download
    • http://1yamal.space/denemuxutolekojidaseken71ert.pdf
    • http://rijigikesezaga.mypressonline.com/ahu_system.pdf
    • http://draiwenstore.online/python_3.7_does_not_have_pipq6ro3.pdf
    • https://jerigarapo.weebly.com/uploads/1/3/5/3/135327201/fonisebowaboka.pdf
    • https://static.s123-cdn-static.com/uploads/4443810/normal_5fded3b80741a.pdf
    • http://andyhong.blog/8185423951374x.pdf
    • http://fafesixokegigi.getenjoyment.net/14621175245.pdf
    • http://voicebftyi.com/35151616022vrgu8.pdf
    • http://1ux.site/what_order_do_the_umbrella_academy_comics_go_int38qb.pdf
    • https://dixapixukezawe.weebly.com/uploads/1/3/5/3/135388261/1594999.pdf
    • http://bibuzikufaje.mygamesonline.org/calendering_process.pdf
    • https://cdn-cms.f-static.net/uploads/4483081/normal_5fd3788487db9.pdf
    • http://athousandbooks.top/server4.php?asin=0133545008..Global
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dupula/reznor_45000_btu_garage_heater_specs.pdf
    • https://s3.amazonaws.com/wiremeresegikon/bianchi_road_bike_sizing_guide.pdf
    • https://s3.amazonaws.com/wujanozo/zolotudazuses.pdf
    • https://s3.amazonaws.com/xapota/acet_december_2018_answer_key.pdf
    • https://s3.amazonaws.com/vuforewebub/satuxivazof.pdf
    • https://s3.amazonaws.com/juwofuxufijup/kabewupevan.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de4a.bin
2dcbcbf01160ab13e4929d70848b845fb10fe5c35925c3f43eb3fd80aaf1661f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4A 5508 bytes
font_01_sfnt_off0000f105.bin
47c55b5e321ee715865b1c61e35efb8fca771bd2911740d46f52d4b5e7379ca4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF105 12824 bytes