Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c0028ae6d91b2f…

MALICIOUS

PDF

68.5 KB Created: 2021-02-09 00:04:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ea876ea3dd6cdeef690b79c3d6a1bdfb SHA-1: bdcb7c66c170ec2650723f5998c3c79b5649aec6 SHA-256: 21c0028ae6d91b2f8df479481d0e2b0cca9f0125661c700189ddb449c52fc675
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags the document as a link farm on disposable hosting, reinforcing the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/aws?utm_term=long+and+short+worksheet+for+class+4 PDF link annotation
    • https://cdn.sqhk.co/jijasitov/dhbNyCH/lotijepujozupinavafoza.pdfIn PDF document text
    • https://fukekagike.weebly.com/uploads/1/3/4/5/134587407/kajam.pdfIn PDF document text
    • http://tells.fun/vorezokolulapoaq8ps.pdfIn PDF document text
    • http://boxberry-24.cc/lowiwidatetinutubawixagaxygqyh.pdfIn PDF document text
    • https://cdn.sqhk.co/lunexubafexo/3heGgh7/rainway_app_review.pdfIn PDF document text
    • https://cdn.sqhk.co/movozuba/Mjbha2N/31399426018.pdfIn PDF document text
    • https://cdn.sqhk.co/munuluxel/R5igchD/loudoun_county_library_overdrive.pdfIn PDF document text
    • https://tawixepew.weebly.com/uploads/1/3/0/7/130739069/kujogakakuwewegoxala.pdfIn PDF document text
    • https://cdn.sqhk.co/zolokike/iegfz8K/zepezixadar.pdfIn PDF document text
    • https://cdn.sqhk.co/buvaboda/Y5bjaiC/wipefitumevasini.pdfIn PDF document text
    • https://nuxogisufebodad.weebly.com/uploads/1/3/5/9/135965827/a92e851346103b5.pdfIn PDF document text
    • https://cdn.sqhk.co/kokademesuz/fuAjjhd/vuvuzupope.pdfIn PDF document text
    • https://panikudar.weebly.com/uploads/1/3/1/4/131437701/153078dcd2.pdfIn PDF document text
    • https://ruwizugaxuluba.weebly.com/uploads/1/3/4/7/134759804/parevi.pdfIn PDF document text
    • https://sujujawajiz.weebly.com/uploads/1/3/5/9/135964945/cbf72.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ce1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1C 5468 bytes
SHA-256: c05229a035cc5c2e5ae2770939a3ff84116bb75ecc66f6f3afe58be43f1c6d6a
font_01_sfnt_off0000e0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D4 10832 bytes
SHA-256: 167d7ce2e198038b9815710db7fea0c53f8243c54bccffcaabab5f26f27aaa37

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