Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4a0f4f182f3cae5…

MALICIOUS

PDF

79.6 KB Created: 2021-03-25 04:02:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 7accce2b18727e53297e7cd611d6c6a6 SHA-1: c21c7ff6c99466042b33d02c9f31438227225e2c SHA-256: d4a0f4f182f3cae547b510886c3406a22d51f9d874c68e4ed391f4c5502f8f1d
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to suspicious domains, identified as a malicious redirector and part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to drive users to malicious 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
  • 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://dafemum.ru/strik?utm_term=do+beats+by+dre+go+on+sale+black+friday In PDF document text
    • http://kimokabif.medianewsonline.com/29901816933.pdfIn PDF document text
    • http://pikejofopon.mypressonline.com/mojujesolopoxuv.pdfIn PDF document text
    • https://cdn.sqhk.co/retirijozi/i5UgcZo/mimpi_gigi_lepas_bagian_atas_kiri.pdfIn PDF document text
    • http://peluxuba.sportsontheweb.net/simow.pdfIn PDF document text
    • http://botefin.medianewsonline.com/79982117199.pdfIn PDF document text
    • https://cdn.sqhk.co/sutazojawote/i1jbgin/88025070940.pdfIn PDF document text
    • http://xofitazuregokud.mywebcommunity.org/yellowstone_campground_map.pdfIn PDF document text
    • http://munasimowijuxi.getenjoyment.net/27154276435.pdfIn PDF document text
    • https://cdn.sqhk.co/xeduwukaxusa/KIgiSgh/tri_blend_shirt_sizing.pdfIn PDF document text
    • http://lizowaw.scienceontheweb.net/tigajesamukumokebabibi.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
    • https://f62823ea-e863-4eb7-bd7c-e3bac0139ff1.filesusr.com/ugd/8c639a_8a56008aadde47518c04d80cdd14b698.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/gapitekomorojide.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/freightliner_dealer_in_bakersfield_california.pdfIn PDF document text
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_df1d9d18a235430292bf4d15083c779b.pdf?index=trueIn PDF document text
    • https://80b2a579-f9ed-4aa0-b91a-ac3c8973c086.filesusr.com/ugd/353d00_d1448a55d3814cd291223aef5f69cae7.pdf?index=trueIn PDF document text
    • https://5cbbff6b-7c47-4fbb-abda-9de5069fbc88.filesusr.com/ugd/1a89c8_0f4e5df548c24a80a19681032db458fb.pdf?index=trueIn PDF document text
    • http://xiniwipilanaju.atwebpages.com/paradise_lost_book_1_explanation.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/cheetah_keyboard_3d_app.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_off0000ea43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA43 5280 bytes
SHA-256: 75d597404c9715524fb386607df1773c693b377b1a66b5a25769807afddc0da6
font_01_sfnt_off0000fc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC44 11296 bytes
SHA-256: 18627812df30d2fa915062772cb91c539c92b6c711d5dd9c8a896fe65f28c6e0
font_02_sfnt_off000122a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A8 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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