Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d2f7213c6f2972a…

MALICIOUS

PDF

86.8 KB Created: 2021-02-25 12:24:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1846d6b83cf71cf7cba0da70a652f5b8 SHA-1: 6b860e33b6dfe89046e2f6f064d6adf48b66945e SHA-256: 9d2f7213c6f2972ade1da2fbfce5bf579bdf42794529d99f7853ac3548fd0a73
136 Risk Score
Tags
free-cdn-ebook-manual-lure

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 an external URI and an SEO redirector link pointing to 'https://jacksth.ru/strik?utm_term=difference+between+dna+and+rna+class+12', suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to lead the user to a malicious site or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/strik?utm_term=difference+between+dna+and+rna+class+12 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4447626/normal_5ff26071bd054.pdfIn PDF document text
    • http://bilkaita.space/context_clues_worksheet_grade_2ekgk6.pdfIn PDF document text
    • http://all-casino.xyz/prevent_form_submit_on_button_click6gwv6.pdfIn PDF document text
    • http://workshop-fb.ru/vojoregibetelak464oa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379355/normal_5ff220bf700b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414672/normal_601e849ac270b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459784/normal_5fc86482f16ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372723/normal_600a8904c2415.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394066/normal_60162bcbdc0dc.pdfIn PDF document text
    • http://julubavixukab.66ghz.com/gubexedan.pdfIn PDF document text
    • http://logvoz.ru/fake_caller_id_online_freerhtvx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485570/normal_5fcf13d0854fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500453/normal_5fef13e7c2564.pdfIn PDF document text
    • http://batmbatm.ru/new_bhakti_dj_song_2015k0n8g.pdfIn PDF document text
    • http://prequester.online/32709666692vj7k0.pdfIn PDF document text
    • http://9gusevshop.website/femesumule2l2w2.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://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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58C 5108 bytes
SHA-256: 2a86996d28402193a0d03212895bb196a8f408d5eb9d24857ff0cd069579c8de
font_01_sfnt_off00010705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10705 10536 bytes
SHA-256: 93f90eb40547eca3f1a1271a6f31f11160460de1a3dcdedc250fe0e91f1b4a42
font_02_sfnt_off00012ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC6 16092 bytes
SHA-256: c9557d91917e40dbb2ce09b7ef560a04a9a832ffe2ebcac6b50408a58351272e
font_03_sfnt_off00013f8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F8E 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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