Malicious PDF — malware analysis report

Static analysis result for SHA-256 21d4e27c74e90992…

MALICIOUS

PDF

82.4 KB Created: 2021-01-06 06:50:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f50fd79af0bf3fbf303f8352dd566312 SHA-1: da3699eb41304320756cd1ec6047c5870fb3335d SHA-256: 21d4e27c74e909920afc1ffcbcc480490054a7f5d45745db56b21b819279ec0d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm designed to redirect users to potentially malicious sites. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, but no clear instructions or lures. No scripts were extracted from this sample, but the PDF structure and numerous external URIs point towards a phishing or content-driven malicious distribution strategy.

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 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://trafffe.ru/aws?utm_term=waterfall+development+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385217/normal_5fad3948100a6.pdfIn PDF document text
    • https://xonimitofowe.weebly.com/uploads/1/3/2/6/132682232/2461809.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470232/normal_5fab2e9a6bb1e.pdfIn PDF document text
    • https://cdn.sqhk.co/kisunika/WmwVpgd/samsung_print_service_plugin_para_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366034/normal_5fad5b49ccd07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428043/normal_5faab03985fff.pdfIn PDF document text
    • https://cdn.sqhk.co/nomavunut/jcia2hb/wordscapes_level_807.pdfIn PDF document text
    • https://tagalevef.weebly.com/uploads/1/3/0/8/130815582/5804016.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388280/normal_5fec557a80d6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390383/normal_5f93526821ebd.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://uploads.strikinglycdn.com/files/0d30392e-d328-4409-b470-7e4f5a1dd22c/jenn_air_refrigerator_repair_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/pefolerizedenodufesuzowaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b1f4a83-7c32-4296-b476-a14ec285e7c5/89575822666.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/75980646304.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/business_law_notes_kenya.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B5 4820 bytes
SHA-256: ba416da6a074dcd0b29662f162406ace61d0c19629662dc11e0762772ee516d1
font_01_sfnt_off0001090e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090E 11060 bytes
SHA-256: ebbafde5915b29204e57379d23f7c17f61ba8e63c37cbe1ca6eec88f549e9ab9
font_02_sfnt_off00012e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E74 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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