Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d5acd73e6ff3a66…

MALICIOUS

PDF

139.4 KB Created: 2021-03-15 17:01:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 069aa9988d1aa2fb12f643d18fbe1113 SHA-1: ee19352564c6c7a23f17d8f441f5bfc6f7d3d13c SHA-256: 1d5acd73e6ff3a660693b4dc67806b6ba3e6e5c26d9c354c6ae50fcb9ac32af0
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 point to PDFs hosted on various subdomains, indicating a link farm or distribution network. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://golowaki.ru/aws?utm_term=numerical+analysis+for+statisticians+solutions+pdf PDF link annotation
    • https://gitufigekuxos.weebly.com/uploads/1/3/4/6/134634758/tavov.pdfIn PDF document text
    • http://vozivovog.scienceontheweb.net/the_tipping_point_malcolm_gladwell_chapter_summary.pdfIn PDF document text
    • http://rupaduwovuw.getenjoyment.net/engineering_drawing_orthographic_projection_examples.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482629/normal_60076c717b2ef.pdfIn PDF document text
    • https://govonomuvilikiw.weebly.com/uploads/1/3/4/6/134620083/6664061.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451970/normal_5fdf3af6aff56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452386/normal_5fd7ebce0ba70.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478408/normal_5ff318cb2176c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477635/normal_5ff1fcb4e7417.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427523/normal_5ff2038168935.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498983/normal_5fcd1f7f00665.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414672/normal_5fe1009c19d21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456143/normal_5fe9eeaa9a642.pdfIn PDF document text
    • https://cdn.sqhk.co/xolilipedeko/fhjjbhh/pezosa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489241/normal_600b687f6e482.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393183/normal_5fc8351c0159b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369190/normal_5fc798495a513.pdfIn PDF document text
    • http://malanefire.sportsontheweb.net/nachi_bearing_catalog.pdfIn PDF document text
    • https://cdn.sqhk.co/bonosexov/aibmEhP/29938635637.pdfIn PDF document text
    • https://pesakezered.weebly.com/uploads/1/3/4/7/134729162/mevumab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475197/normal_6041933dc7ced.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bepolujogox.atwebpages.com/71211933441.pdfIn PDF document text
    • http://pevogikuxupeja.onlinewebshop.net/how_to_open_downloaded_in_kindle_app.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
    • 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_off0001b217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B217 2912 bytes
SHA-256: 8b511c58d3234fa9e6ad089c95d1dc2bd0b31f87be7a4d6a8849fccc4da5c7d6
font_01_sfnt_off0001bc7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC7C 5372 bytes
SHA-256: 7f70dfd239e55f5ce2f7fc51b77f4d6c1b3eb91704a95e7e94a1b03f4e9da6fc
font_02_sfnt_off0001cebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CEBB 16780 bytes
SHA-256: c5cb91394b4aaa3561eb8a15dbdde9d36925334295f4d17ee1354c3d988983bd
font_03_sfnt_off00020593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20593 17048 bytes
SHA-256: c5c11851c9b50774febf27db0509862ca9553934da2530abf030627912d3967e