Malicious PDF — malware analysis report

Static analysis result for SHA-256 387828f296e6370e…

MALICIOUS

PDF

77.1 KB Created: 2021-04-01 11:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 340d04f079c9607a6225417fb54fd8d5 SHA-1: d412b569b01d961d029cf6232d7fe3d07093264d SHA-256: 387828f296e6370e2b09cb1b7db992e86ea5d4ebff995230efa3c5f0b54fe40e
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a malicious site.

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=what+do+you+mean+by+short+story In PDF document text
    • http://varietystore.website/tuvujabifamowof9md13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368501/normal_603e19ca36528.pdfIn PDF document text
    • http://tomolijoponix.mypressonline.com/formato_de_recibo_por_honorarios_sunat.pdfIn PDF document text
    • http://urott-hu.com/ruvigosedxdq4.pdfIn PDF document text
    • http://fegivate.medianewsonline.com/18332198768.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423137/normal_6003bbf98cae2.pdfIn PDF document text
    • http://kitixukizogutik.mygamesonline.org/algorithms_of_oppression.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486346/normal_603cea295714e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/313c2d06-360e-4277-a3ca-c0c72d31cfc5/puxorobelovabizafivoz.pdfIn PDF document text
    • http://zitadufafasid.onlinewebshop.net/poulan_pro_pp5020av_carb_settings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bf5c97a-e5e8-4c0a-918b-2c71d3b17e3d/mirafefuzusoxudojan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6922d02-a635-4adb-9117-61e342285c30/how_to_draw_a_braid_step_by_step_easy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef05fd42-894d-4147-8431-9fa8620c859d/14296278465.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05418be1-8d38-4a8b-8285-de67c63839db/83096504865.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/058db211-45f0-49e7-8d27-02c178b553bb/wogujegimovixaveped.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_off0000f0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C5 5288 bytes
SHA-256: 45d10adb0d48b8bcab568b9d6c96c90be97b31102f18632bdaaef71710256039
font_01_sfnt_off000102a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A2 10936 bytes
SHA-256: 86b764045b90376914ef08be7e8c943dc6ff3b14f3aca71b85555f293e07f6a6

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