Malicious PDF — malware analysis report

Static analysis result for SHA-256 928286ad9b79bc5a…

MALICIOUS

PDF

79.1 KB Created: 2021-03-12 02:18:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 57f2defbb4f0dc16c554c838edbb2b9a SHA-1: 268e9ae6fd384a50dfdd9b94858cb8c413b4b97e SHA-256: 928286ad9b79bc5a53e22065a9429a24fbcca51ec22c099fa9907894e874e8d5
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains and redirectors, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were extracted, the embedded links are the primary attack vector, likely leading to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://yafferge.ru/strik?utm_term=what+is+an+example+of+classical+conditioning+in+your+own+life In PDF document text
    • http://ximasoj.22web.org/lezuwegos.pdfIn PDF document text
    • http://nubatevujonuw.mygamesonline.org/accounting_system_design.pdfIn PDF document text
    • http://zunololanuxigu.sportsontheweb.net/what_does_pals_certification_stand_for.pdfIn PDF document text
    • http://lomuwugevona.getenjoyment.net/47502622763.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://e209d09f-5af8-48a0-acfc-72d03e9bea0d.filesusr.com/ugd/946fcc_fed2777803b44bed82bfa79d92c6830a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/543d4faa-c508-4441-a43d-387ebed818d8/11398105904.pdfIn PDF document text
    • http://dijinisefiregot.rf.gd/car_repair_books.pdfIn PDF document text
    • https://f1801c53-b3f5-4b94-a9b3-4bb8eb376a66.filesusr.com/ugd/af633f_7bb7e0fbaf1f402ab44ad5016e302842.pdf?index=trueIn PDF document text
    • https://994180ce-385f-4272-9833-4a204a825e0f.filesusr.com/ugd/ec0c41_158df15cf25f44e2837808e9499ec18f.pdf?index=trueIn PDF document text
    • https://994180ce-385f-4272-9833-4a204a825e0f.filesusr.com/ugd/ec0c41_65d33d8a28bd483091ca789b958c33f2.pdf?index=trueIn PDF document text
    • http://gigolovumiguse.rf.gd/multiple_sclerosis_treatment_guidelines_australia.pdfIn PDF document text
    • https://2d841ef3-a248-4e6a-996b-2d54d6713fdd.filesusr.com/ugd/1decf9_d1b333ce042b44b1bf524dd94822b364.pdf?index=trueIn PDF document text
    • http://ketafek.epizy.com/strategic_management_process_notes.pdfIn PDF document text
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_60d5da85db8a4c35baa01cb7e9acd8b9.pdf?index=trueIn PDF document text
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_e2c1e388c0ef484bb8ce7ba3080dfa3b.pdf?index=trueIn PDF document text
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_3238b2e22f174711a36e42e2c3036047.pdf?index=trueIn PDF document text
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_e229d141c5524b889dbe8f6143184002.pdf?index=trueIn PDF document text
    • https://4b67404f-136a-46a0-9cf3-151f2d38faab.filesusr.com/ugd/241fd5_a7ac96e411404d20964369ed7e6d398c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/08f44cc6-b5e9-4867-ad14-573cbd606c44/82223173358.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_off0000ea2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2E 5724 bytes
SHA-256: c9475845e911e9e9be4c6e5108f5e2c4fdf6ebcc8e5847d53acc1f1c71f8bcae
font_01_sfnt_off0000fd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD95 10188 bytes
SHA-256: d9b0ff2e7a189ef04896b953f36a42d3fee93a48c02edaba23ac7b62339aea5f
font_02_sfnt_off0001208d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208D 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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