Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cf30a2bf1e3d18c…

MALICIOUS

PDF

70.4 KB Created: 2021-02-24 02:09:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 20bfe3b38ff1260d68c6be427fd7d1a9 SHA-1: 2da3c23bb360cf45aa671ca7c756d97d13b77ef8 SHA-256: 8cf30a2bf1e3d18c00c0ef6670ed8d02dbe726986f63b1f74ad27ebf307146bc
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document also functions as a link farm hosted on disposable domains, suggesting an intent to distribute further malicious content or phishing lures. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wb?keyword=how%20do%20you%20integrate%20cos%20squared%20x In PDF document text
    • https://cdn.sqhk.co/motulobugaji/fwUgeie/knock_down_drag_out_fights_clue.pdfIn PDF document text
    • http://podarokinsta.site/cornerstone_sabbath_school_lesson_3rd_quarter_2019m5k94.pdfIn PDF document text
    • http://zuluwana.iblogger.org/61839846506.pdfIn PDF document text
    • http://freehookup.xyz/25502810065k8sd.pdfIn PDF document text
    • http://wevutibena.22web.org/how_do_i_reset_my_skyworth_remote.pdfIn PDF document text
    • https://cdn.sqhk.co/xolofiwano/iiUOTZf/508148950.pdfIn PDF document text
    • http://clyb-wylcan3.space/android_os_freegomy5.pdfIn PDF document text
    • http://itrom.fun/8349167996ou2nv.pdfIn PDF document text
    • http://lifeeuro.info/batitofazaxevodatapufk9ocd.pdfIn PDF document text
    • https://cdn.sqhk.co/zewezerezi/UgekqlA/ducks_in_a_row_synonym.pdfIn PDF document text
    • http://mawifit.iblogger.org/2519144100.pdfIn PDF document text
    • http://constructionhouse.info/xamapivuwelenedodafozufeh68.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
    • http://furaxem.rf.gd/jotugarepul.pdfIn PDF document text
    • http://gobonelore.epizy.com/66966704406.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/alcestis_bangla.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/animal_planet_birds_video.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_off0000c9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B3 5304 bytes
SHA-256: 36dfb43eb96a63eded4e0ebfdb65b916850535ef6407da4f2a6bc9fd4535b1ea
font_01_sfnt_off0000dbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDC 10124 bytes
SHA-256: 407a5eff0c5a5dd0273752bdf42a868553664700923b99a62209299166d3427a
font_02_sfnt_off0000fe84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE84 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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