Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb6bcccfd220052…

MALICIOUS

PDF

169.5 KB Created: 2021-03-18 06:23:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 59982bb80e91c59b205d2e8d2091141b SHA-1: db81b615050eef51c1069e416e08a0813eba8ee3 SHA-256: bcb6bcccfd2200525611d5fac4c9ede96969d05e3c8fa86e8f3d767ff8c09d80
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to known malicious redirector infrastructure and disposable hosting, aiming to trick users into visiting harmful sites. The heuristic firings and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it functions as a malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 5

  • 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 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/123?utm_term=cara+bobol+wifi+mikrotik+tanpa+root+android In PDF document text
    • https://cdn.sqhk.co/xaxamipuxum/geFNgha/lolilorowidefawofepubuwud.pdfIn PDF document text
    • https://rebageronamit.weebly.com/uploads/1/3/0/7/130775484/gikabukaxuvok.pdfIn PDF document text
    • https://bivapere.weebly.com/uploads/1/3/4/6/134689139/doxigopuviw.pdfIn PDF document text
    • http://sitebomobegux.sportsontheweb.net/physics_volume_1_5th_edition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378379/normal_6019e00d1495b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381740/normal_5fcdb746c8bc5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460982/normal_5ff44b5a9b3b6.pdfIn PDF document text
    • https://xizirujikalowev.weebly.com/uploads/1/3/1/4/131454807/60a86902b.pdfIn PDF document text
    • https://cdn.sqhk.co/senuziker/fjfYhgg/kipurigonesuju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465128/normal_6039965764849.pdfIn PDF document text
    • https://cdn.sqhk.co/zezetemirag/VLiaiba/color_wheel_picker_rgb.pdfIn PDF document text
    • https://vidufatow.weebly.com/uploads/1/3/1/4/131438098/fipilutulawik-kumojafotume-kuvalodir-kapik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482415/normal_5fdc27f754b69.pdfIn PDF document text
    • https://cdn.sqhk.co/pigalixow/i6Tiibf/53349267631.pdfIn PDF document text
    • http://fibutogu.mywebcommunity.org/83924924304.pdfIn PDF document text
    • http://duzegotola.medianewsonline.com/hpi_baja_5b_flux_manual.pdfIn PDF document text
    • https://pebawozo.weebly.com/uploads/1/3/4/8/134865175/sakiribovuvon_rovapebef_ladelud.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/0bc79679-5ee8-4595-ba11-00c16f73a491/angelic_sigils_keys_and_calls_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffb0f602-f1d7-4a02-8df4-9ab88f751e2f/81807229285.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0590a6de-ed01-40df-b439-7444e8b24d14/texeduxurimiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/192b0bea-46b8-4b09-a3a3-ff85d46c3e36/90500905348.pdfIn PDF document text
    • http://kaxuwenewutexu.myartsonline.com/26071736098.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
    • 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_off0002321b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2321B 2908 bytes
SHA-256: bf9f5fb496e7ac98b5751940c140bd876ad9123b9c7ebb8db5bba51d6b779025
font_01_sfnt_off00023c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23C7B 5208 bytes
SHA-256: c90cfebc07dc68b8edd698c6e8426fdd0a80212c1b7318d55c6998dccad2238b
font_02_sfnt_off00024e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24E2F 13624 bytes
SHA-256: 772d4355ab81d00d39c4c4e432dd9823fefce0842397ff60a97ac8d579bb23df
font_03_sfnt_off00027cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27CAC 17452 bytes
SHA-256: bbe4cb6738dfd75526d2a5d274cea4cae6bf1b11a4f38f6ccc6e22a74224499e

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