Malicious PDF — malware analysis report

Static analysis result for SHA-256 164293d4a3adc5b4…

MALICIOUS

PDF

82.3 KB Created: 2021-03-04 13:06:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 9f3c7339f0d91fd66a688706388444ae SHA-1: 0d652fdf8911308b45c57e4f9f3b968a78501a35 SHA-256: 164293d4a3adc5b4e9e93462f9bdbb86b63c40ddde4c7cb362fe4ddaf717ada4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful sites. The document body, though heavily obfuscated, contains text related to 'Elder Scrolls Online character creation simulator', indicating a lure to entice clicks on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://gimoguvi.ru/award?keyword=elder+scrolls+online+character+creation+simulator PDF link annotation
    • https://cdn.sqhk.co/bogulevim/hie649m/calculate_percentage_excel_mac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404755/normal_5fcb97b701496.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477379/normal_600d8d1657fd2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383582/normal_5ffd419836bef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478134/normal_6009452697643.pdfIn PDF document text
    • http://xekedibu.iblogger.org/37630178017.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477181/normal_601bafe4f215d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393345/normal_60349199562e7.pdfIn PDF document text
    • http://vanesifonemume.22web.org/7419900213.pdfIn PDF document text
    • https://cdn.sqhk.co/mogudekusab/dErgfuK/need_for_speed_rivals_cars.pdfIn PDF document text
    • https://cdn.sqhk.co/zubejavaxuvu/jhceXjg/44037136914.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kebanibaru.epizy.com/delhi_metro_pink_line_route_map.pdfIn PDF document text
    • http://gukasitaxe.epizy.com/luzaregan.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/46715583752.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/uniforme_de_bacteriologia_universidad_javeriana.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C8 5136 bytes
SHA-256: 3e5988e9ebaade3c89b1a5a9c20cfcefa4492452bb163898628d8810af650ef7
font_01_sfnt_off00011815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11815 10360 bytes
SHA-256: fa0241a1cc0ac2da25d5e246ad923ceb0ab269096a45704b1b59a0201a19ce62

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