Malicious PDF — malware analysis report

Static analysis result for SHA-256 327375a2f71d7286…

MALICIOUS

PDF

68.9 KB Created: 2021-01-20 05:55:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 99cae8c48b7329e1f3a7d8483e56532c SHA-1: 145a523ff1dd1842228a9196c85fcd78e83b3d5d SHA-256: 327375a2f71d728622f6150cc85000364760bdf79c5316b7b703e66949a82c9f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on low-reputation hosting, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, hinting at its construction. No scripts were extracted, but the overall structure and URL distribution strongly suggest a malicious intent to redirect users to harmful content.

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://jacksth.ru/123?utm_term=counting+atoms+worksheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4411944/normal_5fed7a8335011.pdfIn PDF document text
    • http://soluzixod.66ghz.com/beautiful_hd_wallpaper_for_android_phone.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366406/normal_5fe3e6f3cc0a4.pdfIn PDF document text
    • https://site-1177540.mozfiles.com/files/1177540/7633833276.pdfIn PDF document text
    • https://cdn.sqhk.co/minamojazi/ggghjdc/13124355734.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410731/normal_5f9bdd3b01e54.pdfIn PDF document text
    • https://site-1252473.mozfiles.com/files/1252473/suzuki_owners_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/madagijoj/gfgfjje/score_hero_hacked_version_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/jisaside/eSghVij/globe_mybusiness_prepaid_review.pdfIn PDF document text
    • https://site-1177330.mozfiles.com/files/1177330/suzadule.pdfIn PDF document text
    • https://site-1202007.mozfiles.com/files/1202007/best_download_browser_app.pdfIn PDF document text
    • https://site-1253095.mozfiles.com/files/1253095/batman_returns_comic_adaptation.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387571/normal_60073ddcf200a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480389/normal_5fadaa4bdaf50.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bowubibegejojop.rf.gd/c_cast_template_type.pdfIn PDF document text
    • http://bevevekafoli.epizy.com/unifi_ap_ac_lite_quick_start_guide.pdfIn PDF document text
    • http://girigiroret.rf.gd/32785018836.pdfIn PDF document text
    • http://kagumaxapa.rf.gd/54588144986.pdfIn PDF document text
    • http://ritanuwo.epizy.com/free_homemade_wine_labels_templates.pdfIn PDF document text
    • http://redepulevinevux.epizy.com/sheetrock_garage_code.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_off0000d369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD369 5128 bytes
SHA-256: db7765669a97a2a8dddac67bdd59c51b87b772e4b77e26dd4447e18cfd00c89d
font_01_sfnt_off0000e4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BF 9876 bytes
SHA-256: ce4e4208ad30b2daf38da6ecedcd4d3d5481c86aba4149dce6e0a9c50ab4fa1b

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