Malicious PDF — malware analysis report

Static analysis result for SHA-256 721f602ceebb3897…

MALICIOUS

PDF

71.7 KB Created: 2021-03-21 01:51:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 005b5e95d508303f5a399bb6ba851e9e SHA-1: 5997555db6f0fb19954c48404984eb77e575dd3d SHA-256: 721f602ceebb3897ce4ef3240d51feab060a6e8d247a5883557fe4a6dbea0e7f
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains multiple embedded URLs, with one pointing to a disposable domain, suggesting a link farm or redirection to a malicious site. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

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://static.s123-cdn-static.com/uploads/4423427/normal_6001106bc9a2f.pdf In PDF document text
    • http://igoscandinavia.com/karexawemigwtbwx.pdfIn PDF document text
    • http://buxozadogaro.22web.org/bevars_naa_songs_free_2018.pdfIn PDF document text
    • https://sixalusizefew.weebly.com/uploads/1/3/1/3/131378898/1373273.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482403/normal_5fc6a02b8b206.pdfIn PDF document text
    • http://shlifovka-pol.website/how_to_program_toshiba_ct-90302_remote_to_dvd_playerihx14.pdfIn PDF document text
    • https://sexuviruzimi.weebly.com/uploads/1/3/2/8/132814305/8281947.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/bVCGPfG74RQ/wb?keyword=radio%20thermostat%20ct30%20battery%20replacementPDF link annotation
    • http://xorosobodudirug.rf.gd/ingenuity_swing_not_working.pdfIn PDF document text
    • https://9849c7ec-8b19-4b81-9a64-db2537ea7c40.filesusr.com/ugd/97b1c0_b4f70f4ed9c84e30af6fd3efbd26de36.pdf?index=trueIn PDF document text
    • https://938a05da-450f-421e-a59b-0448473a402a.filesusr.com/ugd/cb5dea_eec20738761e4f48bebb782b43cb42da.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0c20962-2823-4ad2-b02c-3dbef771c4b0/what_goes_good_with_red_wine_vinegar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b460990b-dca6-4e0a-af55-ed2d35a99554/interior_designing_games_app_store.pdfIn PDF document text
    • https://de315c38-daa2-4293-b666-e554ba9b7d65.filesusr.com/ugd/564d2e_cfbc529882f74d35a4717473df05aac0.pdf?index=trueIn PDF document text
    • http://dibojun.epizy.com/rejulus.pdfIn PDF document text
    • https://f64a1a0a-debf-4843-a838-a34c0cae0f4a.filesusr.com/ugd/89602e_99d8f94460d6420e9b48a9b098dc285b.pdf?index=trueIn 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_off0000da69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA69 5868 bytes
SHA-256: 7fd7778e447f978d854affaa5366f120006e964acf0855ae091585276284eff6
font_01_sfnt_off0000ee38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE38 10540 bytes
SHA-256: e89095b411631a1725b314a83925f471ad2ab9397aed689a7c378a429d08f3ac

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